June 3 is the 154th day of the year (155th in leap years), with 211 days remaining.
- 1803 — Giorgio Orsolano is born.
- 1892 — Thomas Neill Cream is apprehended.
- 1953 — John W. Hopkins is born.
- 1960 — Karel Kopáč is born.
- 1976 — Michael Bonnin is murdered by John Wayne Gacy.
- 1980 — William Bonin's victim, Steve Wells is found.
- 1981 — Kimberly Compton is murdered by Paul Michael Stephani.
- 1982 — Arwed Imiela died.
- 1985 — Brian Dugan is apprehended.
- 1995 — Andrew Hammond is born.
- 1996 — Francisco del Junco is apprehended.
- 1998 — Douglas Gretzler died.
- 2009 — Telacia Fortson is murdered by Anthony Sowell.
- 2014 — Kaisa Vornanen-Karaduman is apprehended.
- 2023 — Ram Prasad is allegedly murdered by Pankaj Sharma (suspected victim).
- 2024 — Janer Morales Poveda is apprehended.