| Date | Name | Connection with case | Cause of death |
|---|---|---|---|
| 11/63 | Karyn Kupicinet | Tv host's daughter who was overheard telling of JFK's death prior to 11/22/63 | Murdered |
| 12/63 | Jack Zangretti | Expressed foreknowledge of Ruby shooting Oswald | Gunshot Victim |
| 2/64 | Eddy Benavides | Lookalike brother to Tippit shooting witness, Domingo Benavides | Gunshot to head |
| 2/64 | Betty MacDonald* | Former Ruby employee who alibied Warren Reynolds shooting suspect. | Suicide by hanging in Dallas Jail |
| 3/64 | Bill Chesher | Thought to have information linking Oswald and Ruby | Heart attack |
| 3/64 | Hank Killam* | Husband of Ruby employee, knew Oswald acquaintance | Throat cut |
| 4/64 | Bill Hunter* | Reporter who was in Ruby's apartment on 11/24/63 | Accidental shooting by policeman |
| 5/64 | Gary Underhill* | CIA agent who claimed Agency was involved | Gunshot in head ruled suicide |
| 5/64 | Hugh Ward* | Private investigator working with Guy Banister and David Ferrie | Plane crash in Mexico |
| 5/64 | DeLesseps Morrison* | New Orleans Mayor | Passenger in Ward's plane |
| 8/64 | Teresa Norton* | Ruby employee | Fatally shot |
| 6/64 | Guy Banister* | x-FBI agent in New Orleans connected to Ferrie, CIA, Carlos Marcello & Oswald | Heart attack |
| 9/64 | Jim Koethe* | Reporter who was in Ruby's apartment on 11/24/63 | Blow to neck |
| 9/64 | C.D. Jackson | "Life" magazine senior Vice-president who bought Zapruder film and locked it away | Unknown |
| 10/64 | Mary Pinchot | JFK "special" friend whose diary was taken by CIA chief James Angleton after her death | Murdered |
| 1/65 | Paul Mandal | "Life" writer who told of JFK turning to rear when shot in throat | Cancer |
| 3/65 | Tom Howard* | Ruby's first lawyer, was in Ruby's apartment on 11/24/63 | Heart attack |
| 5/65 | Maurice Gatlin* | Pilot for Guy Banister | Fatal fall |
| 8/65 | Mona B. Saenz* | Texas Employment clerk who interviewed Oswald | Hit by Dallas bus |
| ?/65 | David Goldstein | Dallasite who helped FBI trace Oswald's pistol | Natural causes |
| 9/65 | Rose Cheramie* | Knew of assassination in advance, told of riding to Dallas with Cubans | Hit/run victim |
| 11/65 | Dorothy Kilgallen* | Columnist who had private interview with Ruby, pledged to "break" JFK case | Drug overdose |
| 11/65 | Mrs. Earl Smith* | Close friend to Dorothy Kilgallen, died two daysafter columnist, may have kept Kilgallen's notes | Cause unknown |
| 12/65 | William Whaley* | Cab driver who reportedly drove Oswald to Oak Cliff (The only Dallas taxi driver to die on duty) | Motor collision |
| 1966 | Judge Joe Brown | Presided over Ruby's trial | Heart attack |
| 1966 | Karen "Little Lynn" Carlin* | Ruby employee who last talked with Ruby before Oswald shooting | Gunshot victim |
| 1/66 | Earlene Roberts | Oswald's landlady | Heart attack |
| 2/66 | Albert Bogard* | Car salesman who said Oswald test drove new car | Suicide |
| 6/66 | Capt. Frank Martin | Dallas policeman who witnessed Oswald slaying, told Warren Commission "there's a lot to be said but probably be better if I don't say it" | Sudden cancer |
| 8/66 | Lee Bowers Jr.* | Witnessed men behind picket fence on Grassy Knoll | Motor accident |
| 9/66 | Marilyn "Delila Walle* | Ruby dancer | Shot by husband after 1 month of marriage |
| 10/66 | Lt. William Pitzer* | JFK autopsy photographer who described his duty as "horrifying experience" | Gunshot ruled suicide |
| 11/66 | Jimmy Levens | Fort Worth nightclub owner who hired Ruby employees | Natural causes |
| 11/66 | James Worrell Jr.* | Saw man flee rear of Texas School Book Depository | Motor accident |
| 1966 | Clarence Oliver | Dist. Atty. Investigator who worked Ruby case | Unknown |
| 12/66 | Hank Suydam | Life magazine official in charge of JFK stories | Heart attack |
| 1967 | Leonard Pullin | Civilian Navy employee who helped film "Last Two Days" about assassination | One-car crash |
| 1/67 | Jack Ruby* | Oswald's slayer | Lung cancer (he told family he was injected with cancer cells) |
| 2/67 | Harold Russell* | Saw escape of Tippit killer | killed by cop in bar brawl |
| 2/67 | David Ferrie* | Acquaintance of Oswald, Garrison suspect and employee of Guy Banister | Blow to neck (ruled accidental) |
| 2/67 | Eladio Del Valle* | Anti-Castro Cuban associate of David Ferrie being sought by Garrison | Gunshot wound, ax wound tohead |
| 3/67 | Dr. Mary Sherman* | Ferrie associate working on cancer research | Died in fire (possibly shot) |
| 1/68 | A. D. Bowie | Asst. Dallas District Attorney prosecuting Ruby | Cancer |
| 4/68 | Hiram Ingram | Dallas Deputy Sheriff, close friend to Roger Craig | Sudden cancer |
| 5/68 | Dr. Nicholas Chetta | New Orleans coroner who on death of Ferrie | Heart attack |
| 8/68 | Philip Geraci* | Friend of Perry Russo, told of Oswald/Shaw conversation | Electrocution |
| 1/69 | Henry Delaune* | Brother-in-law to coroner Chetta | Murdered |
| 1/69 | E.R. Walthers* | Dallas Deputy Sheriff who was involved in Depository search, claimed to have found .45-cal. slug | Shot by felon |
| 1969 | Charles Mentesana | Filmed rifle other than Mannlicher-Carcano being taken from Depository | Heart attack |
| 4/69 | Mary Bledsoe | Neighbor to Oswald, also knew David Ferrie | Natural causes |
| 4/69 | John Crawford* | Close friend to both Ruby and Wesley Frazier, who gave ride to Oswald on 11/22/63 | Crash of private plane |
| 7/69 | Rev. Clyde Johnson* | Scheduled to testify about Clay Shaw/Oswald connection | Fatally shot |
| 1970 | George McGann* | Underworld figure connected to Ruby friends, wife, Beverly, took film in Dealey Plaza | Murdered |
| 1/70 | Darrell W. Garner | Arrested for shooting Warren Reynolds, released after alibi from Betty MacDonald | Drug overdose |
| 8/70 | Bill Decker | Dallas Sheriff who saw bullet hit street in front of JFK | Natural causes |
| 8/70 | Abraham Zapruder | Took famous film of JFK assassination | Natural causes |
| 12/70 | Salvatore Granello* | Mobster linked to both Hoffa,Trafficante, and Castro assassination plots | Murdered |
| 1971 | James Plumeri* | Mobster tied to mob-CIA assassination plots | Murdered |
| 3/71 | Clayton Fowler | Ruby's chief defense attorney | Uknown |
| 4/71 | Gen. Charles Cabell* | CIA deputy director connected to anti-Castro Cubans | Collapsed and died afterphysical at Fort Myers |
| 1972 | Hale Boggs* | House Majority Leader, member of Warren Commission who began to publicly express doubts about findings | Disappeared on Alaskan plane flight |
| 5/72 | J. Edgar Hoover* | FBI director who pushed "lone assassin" theory in JFK assassination | Heart attack (no autopsy) |
| 9/73 | Thomas E. Davis* | Gunrunner connected to both Ruby and CIA | Electrocuted trying to steal wire |
| 2/74 | J.A. Milteer* | Miami right-winger who predicted JFK's death and capture of scapegoat | Heater explosion |
| 1974 | Dave Yaras* | Close friend to both Hoffa and Jack Ruby | Murdered |
| 7/74 | Earl Warren | Chief Justice who reluctantly chaired Warren Commission | Heart failure |
| 8/74 | Clay Shaw* | Prime suspect in Garrison case, reportedly a CIA contact with Ferrie and E. Howard Hunt | Possible cancer |
| 1974 | Earle Cabell | Mayor of Dallas on 11/22/63, whose brother, Gen. Charles Cabell was fired from CIA by JFK | Natural causes |
| 6/75 | Sam Giancana* | Chicago Mafia boss slated to tell about CIA-mob death plots to Senate Committee | Murdered |
| 7/75 | Clyde Tolson | J. Edgar Hoover's assistant and roommate | Natural causes |
| 1975 | Allen Sweatt | Dallas Deputy Sheriff involved in investigation | Natural causes |
| 12/75 | Gen. Earle Wheeler | Contact between JFK and CIA | Unknown |
| 1976 | Ralph Paul | Ruby's business partner connected with crime figures | Heart attack |
| 4/76 | James Chaney | Dallas motorcycle officer riding to JFK's right rear who said JFK "struck in the face" with bullet | Heart attack |
| 4/76 | Dr. Charles Gregory | Governor John Connally's physician | Heart attack |
| 6/76 | William Harvey* | CIA coordinator for CIA-mob assassination plans against Castro | Complications from heart surgery |
| 7/76 | John Roselli* | Mobster who testified to Senate Committee and was to appear again | Stabbed and stuffed in metal drum |
| Date | Name | Connection with case | Cause of Death |
|---|---|---|---|
| 1/77 | William Pawley* | Former Brazilian Ambassador connected to Anti-Castro Cubans, crime figures | Gunshot ruled suicide |
| 3/77 | George DeMohrenschildt* | Close friend to both Oswald and Bouvier family (Jackie Kennedy's parents), CIA contract agent | Gunshot wound ruled suicide |
| 3/77 | Carlos Prio Soccaras* | Former Cuban President, money man for anti-Castro Cubans | Gunshot wound ruled suicide |
| 3/77 | Paul Raigorodsky | Business friend of George DeMohrenschildt and wealthy oilmen | Natural causes |
| 5/77 | Lou Staples* | Dallas radio Talk Show host who told friends he would break assassination case | Gunshot to head,ruled suicide |
| 6/77 | Louis Nichols | Former No. 3 man in FBI, worked on JFK investigation | Heart attack |
| 8/77 | Alan Belmont | FBI official who testified to Warren Commission | "Long illness" |
| 8/77 | James Cadigan | FBI document expert who testified to Warren Commission | Fall in home |
| 8/77 | Joseph C. Ayres* | Chief steward on JFK's Air Force One | Shooting accident |
| 8/77 | Francis G. Powers* | U-2 pilot downed over Russia in 1960 | Helicopter crash (He reportedly ran out of fuel) |
| 9/77 | Kenneth O'Donnell | JFK's closest aide | Natural causes |
| 10/77 | Donald Kaylor | FBI fingerprint chemist | Heart attack |
| 10/77 | J.M. English | Former head of FBI Forensic Sciences Laboratory | Heart attack |
| 11/77 | William Sullivan* | Former No. 3 man in FBI, headed Division 5, counter- espionage and domestic intelligence | Hunting accident |
| 1978 | C.L. "Lummie" Lewis | Dallas Deputy Sheriff who arrested Mafia man Braden in Dealey Plaza | Natural causes |
| 9/78 | Garland Slack | Man who said Oswald fired at his target at rifle range | Unknown |
| 1/79 | Billy Lovelady | Depository employee said to be the man in the doorway in AP photograph | Complications from heart attack |
| 6/80 | Jesse Curry | Dallas Police Chief at time of assassination | Heart attack |
| 6/80 | Dr. John Holbrook | Psychiatrist who testified Ruby was not insane | Heart attack but pills, notes found, |
| 1/81 | Marguerite Oswald | Mother of accused assassin | Cancer |
| 10/81 | Frank Watts | Chief felony prosecutor for Dallas D.A. | Natural causes |
| 1/82 | Peter Gregory | Original translator for Marina Oswald and Secret Service | Natural causes |
| 5/82 | Dr. James Weston | Pathologist allowed to see JFK autopsy material for HSCA | Died while jogging, ruled natural causes |
| 8/82 | Will H. Griffin | FBI agent who reportedly said Oswald was "definitely" an FBI informant | Cancer |
| 10/82 | W. Marvin Gheesling | FBI official who helped supervise JFK investigation | "Long illness" |
| 3/84 | Roy Kellerman | Secret Service agent in charge of JFK limousine | Unknown |
Following names are the recently known deaths, almost all died of natural causes:
| Date | Name | Connection with case | Cause of Death |
|---|---|---|---|
| 10/92 | Jim Garrison | Former District Attorney of New Orleans, only one who sued in the JFK assassination case | Natural causes |
| ?/94 | Perry Russo | witness who told he had seen Shaw, Oswald and Ferrie talking about the killing of JFK | Unknown |
| 01/95 | Rose Kennedy | Mother of John F. Kennedy | natural causes |
| 01/95 | L.C. Graves | wrested Ruby's revolver away from him after shooting Oswald | natural causes |
| 2/95 | Irving L. Goldberg | Judge who advised L. B. Johnson on transition of power | natural causes |
| 3/95 | Philip L. Willis | Dealey Plaza Witness, photographer | Leukemia |
| 5/95 | Evelyn Norton Lincoln | JFK's personal secretary | natural causes |
| 5/95 | Phil L. Barleson | Defender of Ruby | Heart attack |
| 11/95 | Richard Case Nagell | CIA agent who claimed he uncovered a "large operation" aimed at killing JFK | heart disease |
| 12/95 | James W. Altgens | Dealey Plaza Witness, press photographer | natural causes |
| 1/96 | Ralph W. Yarborough | Dealey Plaza witness, rode in motorcade | natural causes |
| 7/96 | Melvin Belli | Lawyer of KJack Ruby | Suffering stroke and pneumonia |
| 8/96 | Charles Brehm | Dealey Plaza Witness | Unknown |
| 9/96 | McGeorge Bundy | Top aide to JFK and LBJ | Heart attack |
| 10/96 | Rufus Youngblood | Agent who shielded LBJ during the JFK murder | Cancer |
| 10/96 | Larry Ray Harris | Researcher | Car accident |
| 10/96 | Lawrence Brantley | Sold Jack Ruby the gun used to kill Oswald | Complications from surgery |