May 20 is the 140th day of the year (141st in leap years). There are 225 days remaining.
- 1930 — Yiya Murano is born.
- 1970 — Mohammed Bijeh is born.
- 1979 — Wesley Brownlee is born.
- 1980 — William Bonin's suspected victim, Sean King is found.
- 1987 — Leola Douglas is murdered by Anthony Kirkland.
- 1990 — Ricky Beeks (Raymond Lamont Smith) is murdered by Jeffrey Dahmer.
- 1996 — Efraín Sarmiento Cuero is born.
- 1998 — Eric Matthews is apprehended.
- 1999 — Robert Wagner is apprehended.
- 2005 — Loretta Lewis is murdered by the "Jeff Davis 8".
- 2006 — Bobby Jack Fowler died.
- 2010 — Paula Leclair is murdered by Camille Cléroux.
- 2014 — Jerry Fletcher died.
- 2023 — Jesse Fraga is allegedly murdered by Raul Meza (suspected victim).