January 31 is the 31st day of the year. There are 334 days remaining (335 in leap years).
- 1939 — Jerry Brudos is born.
- 1949 — Victor Awwad died.
- 1949 — Robert Berdella is born.
- 1961 — Darin Kendrick (victim) is born.
- 1963 — Lee Choon-jae is born.
- 1992 — Aileen Wuornos is sentenced to Death for the first time.
- 2006 — Ralph Andrews died.
- 2007 — Eli Stutzman died.
- 2008 — Gary Hilton is sentenced to Life imprisonment in Georgia, United States.
- 2013 — Harry Greenwell died.