Conversation so far:
How did Harold Shipman die?
Harold Shipman hanged himself in his cell at Wakefield Prison.
What year did Harold Shipman die?
Harold Shipman died in 2004.
How many years had Harold Shipman served in prison at time of death?
Harold Shipman had served less than four years of imprisonment when he died.

Question: Where was he buried?
Self-contained rewrite: Where was Harold Shipman buried?