April 11 is the 101st day of the year (102nd in leap years). There are 264 days remaining.
- 1915 — Maria Swanenburg died.
- 1935 — Richard Kuklinski is born.
- 1941 — Felícitas Sánchez Aguillón is apprehended.
- 1947 — Louise Peete died.
- 1953 — Michel Proot is allegedly born.
- 1971 — Kathy Bilek is murdered by Karl F. Werner.
- 1973 — Larysa Siarhiejeva is murdered by Gennady Mikhasevich.
- 1992 — Patricia Smith is allegedly murdered by the "I-70 Killer" (suspected victim).
- 1992 — Patricia "Trish" Magers is allegedly murdered by the "I-70 Killer" (suspected victim).
- 1992 — Jerome Dennis's 5th known victim is found.
- 1993 — Donna Sundling is murdered by Robert Spangler.
- 1997 — Andrew Six is apprehended.
- 2010 — Rodrigo Ezcurra is murdered by Marcelo Antelo.
- 2011 — Joseph Naso is apprehended.
- 2014 — Ronald James Ward died.
- 2014 — Steven Gordon is apprehended.
- 2018 — William Davis is apprehended.
- 2021 — Debra Walker is attacked by the "Arkansas Serial Killer".