May 25 is the 145th day of the year (146th in leap years). There are 220 days remaining.
- 1945 — Mitsuko Miyazaki is murdered by Yoshio Kodaira.
- 1946 — Marcel Petiot died.
- 1965 — Ludvík Černý is born.
- 1965 — Ursula Fritz is murdered by Ernst-Dieter Beck.
- 1968 — Stanley Rice is apprehended.
- 1969 — Jerry Brudos is apprehended.
- 1984 — Luke Tredway is murdered by Douglas Wright.
- 1987 — Paweł Tuchlin died.
- 1992 — Anna Lopez is murdered by Joel Rifkin.
- 2005 — Andrea Arrigoni died.
- 2007 — Prothero, Mark (2007). Defending Gary: Unraveling the Mind of the Green River Killer, Jossey-Bass. is released.
- 2010 — Stephen Griffiths's victim, Suzanne Blamires, is found.
- 2014 — Roman Kobyzev is apprehended.
- 2023 — Heather Pressdee is apprehended.
- 2024 — Karim Salim is apprehended.