John George Haigh was known as the acid bath murder.  He was a serial killer that murdered his victims and put their bodies in sulphuric acid afterwards.  He was a master at forging signatures, and this allowed him to gain access to his victim's possessions and money.

https://www.drinkingthecoolaid.com/

Resources:
The Acid Alchemist: A True Story of Murder, Deceit, and Unspeakable Horror. , Brown, Robert - Amazon.com