- Apr 1 Lev Landau, Russian physicist (1962 Nobel Prize for Physics for superfluidity theory), dies from injuries from an earlier car accident at 60
Martin Luther King Jr. (1929-1968)
Apr 4 American clergyman and leader of the Civil Rights Movement (Nobel 1964), assassinated at the Lorraine Hotel in Memphis, Tennessee at 39
Jim Clark (1936-1968)
Apr 7 Scottish auto racer (Indianapolis 500 1965, World F1 Champion 1963, 65; 25 x F1 GP wins), dies in race accident at Hockenheim, Germany at 32
- Apr 10 Gustavs Celmins, Latvian politician (b. 1899)
- Apr 12 Heinrich Nordhoff, German automobile engineer and Volkswagen director (b. 1899)
- Apr 15 Borys Lyatoshynsky, Ukrainian composer, conductor, and teacher, known as the father of modern Ukrainian music, dies at 73
- Apr 16 Edna Ferber, American author and playwright (American Beauty, Cimarron), dies at 82
- Apr 16 Fay Bainter, actress (Jezebel, Our Town, State Fair), dies at 76
- Apr 17 Margaret Seddon, American stage and screen actress (Mr. Deeds Goes to Town), dies at 95
- Apr 19 Tommy Bridges, American baseball pitcher (Detroit Tigers), dies at 61
- Apr 20 Mabel Stark, American tiger trainer "crazy Mabel", found dead after her suicide at 79
- Apr 20 Marion Weeks, American silent film actress, and Ziegfield Follies singer and dancer, dies of stroke at 81
- Apr 21 Norman Demuth, British composer and musicologist specializing in French works, dies at 69
- Apr 22 Stephen H. Sholes, American record producer (Elvis) and label executive (RCA Victor, 1929-68), dies of a heart attack at 57
- Apr 24 Norman McKaye, actor (Untamed Fury, Frogman), dies at 62
- Apr 24 Tommy Noonan, American actor, screenwriter and producer (Gentlemen Prefer Blondes, Promises Promises), dies of a brain tumor at 46
- Apr 25 Walter Tewksbury, American track and field athlete (Olympics, 1920 - 2 gold, 2 silver, 1 bronze), and dentist, dies at 92 [1]
Assassination
Drug Overdose
Gunshot Wound
Murder
Plane Crash
Suicide