Conversation so far:
When did Harold Shipman die?
Harold Shipman committed suicide on 13 January 2004, one day prior to his 58th birthday.
How did Harold Shipman die?
Harold Shipman committed suicide by hanging himself in his cell at Wakefield Prison.

Question: What did he do leading up to his death?
Self-contained rewrite: What did Harold Shipman do leading up to his death?