Claim: Michael Gambon acted in the lead role of The Singing Detective.
Evidence: 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.
The Singing Detective is a BBC television serial drama , written by Dennis Potter , which stars Michael Gambon and was directed by Jon Amiel.