May 3 is the 123rd day of the year (124th in leap years). There are 242 days remaining.
- 1886 — Thomas Britland is murdered by Mary Ann Britland.
- 1962 — Rubén Millatureo Vargas is born.
- 1967 — Ronald Lee Moore is born.
- 1974 — Daniel Camargo Barbosa is apprehended.
- 1974 — Eric Matthews is born.
- 1983 — Carol Ann Christensen is murdered by Gary Ridgway.
- 1984 — Carlton Gary is apprehended.
- 1989 — Paul J. Cowart is murdered by Ray and Faye Copeland (possibly killed on May 4).
- 1992 — Nancy Kitzmiller is murdered by the "I-70 Killer".
- 2007 — Ronald Janssen's victim, Annick Van Uytsel, is found.
- 2012 — Joseph Kondro died.
- 2014 — Charlotte Trego is murdered by Neal Falls.