Herbert William Mullin is an American serial killer who killed thirteen people in California in the early 1970s. He confessed to the killings, which he claimed prevented earthquakes. He noted that there were no earthquakes during his killing spree, and felt vindicated when a Mw 5.8 earthquake hit the area soon after his arrest. In 1973, after a trial to determine whether he was insane or culpable, he was convicted of two murders in the first degree and nine in the second, and sentenced to life imprisonment. He has been denied parole 10 times and is unlikely to ever be released.

Handwritten postcard with missive and pen art signed twice. (front and back pictured).