April 6 is the 96th day of the year (97th in leap years). There are 269 days remaining.
- 1900 — Cayetano Grossi died.
- 1902 — Mabel Bell (victim) is born.
- 1902 — Jennie Gunness is murdered by Belle Gunness.
- 1907 — Ole Budsberg is murdered by Belle Gunness.
- 1944 — Charles Sobhraj is born.
- 1955 — Keith Jesperson is born.
- 1962 — Vladimir Gordovenko is born.
- 1973 — Vladimir Krishtopa is born.
- 1975 — Denise Lynn Oliverson is murdered by Ted Bundy.
- 1976 — Darrell Samson is murdered by John Wayne Gacy.
- 1981 — Brenda Gerow is allegedly murdered by John Kalhauser (suspected victim).
- 1984 — Robert Danielson is apprehended.
- 1984 — Elizabeth Lamotte is allegedly murdered by the "Bible Belt Strangler" (suspected victim).
- 1986 — Marta Eugenia Zamora Martínez, María Gabriela Salas Zamora, María Auxiliadora Salas Zamora, Carla Virginia Salas Zamora, Alejandra Sandí Zamora, Carla María Sandí Zamora and María Eugenia Sandí Zamora are murdered by "El Psicópata".
- 1986 — Jason B. McColley is murdered by Michael Terry.
- 1987 — Donald Harvey is apprehended.
- 1987 — Michael Torrence is apprehended.
- 1992 — Donald Harding died.
- 1994 — Aaron Saucedo is born.
- 1995 — Lisa Ann Warner's victim, Robert Shulman, is found.
- 1996 — Robert Shulman is apprehended.
- 1997 — Dimitris Vakrinos is apprehended.
- 2002 — Patricia Bentley is murdered by Charles Helem.
- 2006 — Sergey Osipenko is apprehended.
- 2014 — Joseph Stephen Holt died.