There are two bands with the name Post Mortem 1. Was an anarchist punk band from England. 2. Post Mortem (not confused with Post-Mortem and Postmortem) was thrash metal band formed on March 22, 1982, in the outskirts of Boston, Massachusetts. They merged some fast thrash metal parts with slowly doom fragments and near-death metal vocals. The definitive line-up was finally settled on in early 1985.