May 13 is the 133rd day of the year (134th in leap years). There are 232 days remaining.
- 1827 — Elise Schmidt is murdered by Gesche Gottfried.
- 1937 — Lester Brockelhurst is apprehended.
- 1943 — Donald Beardslee is born.
- 1946 — Waneta Hoyt is born.
- 1978 — Velma Barfield is apprehended.
- 1978 — Charles Hattula is allegedly murdered by John Wayne Gacy (suspected victim).
- 1979 — Sid Ahmed Rezala is born.
- 1984 — Ngeun Thi Long is murdered by Bobby Joe Long.
- 1994 — Alverson Carter Jr. is murdered by Gary Ray Bowles.
- 2005 — Michael Ross died.