Oliver Queenan

Queenan is a fictional police captain featured in the 2006 crime drama film The Departed, directed by Martin Scorsese. He was played by actor Martin Sheen.

Overview
Queenan was a veteran member of the Boston police department and worked alongside a staff sergeant named Dignam. Queenan and Dignam put together a special task force to infiltrate the organization headed by crime boss Frank Costello. They took Billy Costigan, fresh out of the academy and had him become a member of Costello's gang. In the middle of an operation, Queenan went to meet with Costigan, but ran afoul of Costello's men, who pushed him off the roof of a building. His body landed on the street below right in front of Costigan.