Herbert William Mullin was an American serial killer born on April 18, 1947 who operated in Santa Cruz, CA. 
Mullin was serving life in prison for 13 murders which he says he committed to prevent further natural disasters.  Mullin died of natural causes on August 18, 2022.

Polaroid photograph taken on December 14, 2006 of Mullin.
The back of the photo is hand signed and dated by both a guard and by Mullin.
Hand signed, H.W. Mullin.