Question: What was the name of the character played by an actor from the last six Harry Potter films in the BBC television serial "The Singing Detective"?
Sentence (from "Michael Gambon"): Gambon has played the eponymous mystery writer protagonist in the BBC television serial "The Singing Detective", Jules Maigret in the 1990s ITV serial "Maigret", and Professor Albus Dumbledore in the final six "Harry Potter" films after the death of previous actor Richard Harris.
Relevant evidence: Yes