April 12 is the 102nd day of the year (103rd in leap years). There are 263 days remaining.
- 1869 — Henri Désiré Landru is born.
- 1919 — Henri Désiré Landru is apprehended.
- 1943 — Robert Durst is born.
- 1945 — Lawrence Dalton is born.
- 1947 — Robert Bradley died.
- 1953 — John Balaban is apprehended.
- 1960 — Sam Chinn is born.
- 1969 — Mary Freeman is murdered by Leroy Snyder.
- 1971 — Karl F. Werner's 3rd known victim, Kathy Bilek, is found.
- 1973 — Jeremy Bryan Jones is born.
- 1975 — Juanita Mott is murdered by Fred West.
- 1982 — Ruby Burkett is murdered by Nathaniel Burkett.
- 1983 — Denis Pischikov is born.
- 1985 — Michael Carroll is murdered by Leonard Lake and Charles Ng.
- 1988 — Farida Hammiche is murdered by Michel Fourniret.
- 1992 — Jerome Dennis is apprehended.
- 1993 — Anna Narsisyan is murdered by Sergei Ryakhovsky.
- 1999 — Misael Perreira da Silva is apprehended.
- 1999 — Marion Albert Pruett died.
- 2000 — Jeong Du-yeong is apprehended.
- 2003 — Cory Morris's 5th known victim, Julie Castillo, is found.
- 2003 — Cory Morris is apprehended.
- 2003 — Robert Nicolaus died.
- 2004 — Valery Skoptsov died.
- 2012 — David Alan Gore died.
- 2015 — Johnny Avalos is apprehended.
- 2021 — Marlon Franklin is murdered by "Arkansas Serial Killer".
- 2022 — Freddrick Jackson is apprehended.
- 2023 — Louis Gaskin died.