Anthony "Tony" Renzulli is a Police Sergeant and the training officer for Jamie Reagan.
Renzulli knows the beat of his precinct very well and offers Jamie a lot of good advice. Anthony is known to pay attention to detail that others might not notice. He believes Jamie will make a great cop and often pokes fun at him for abandoning a lucrative law career.
Trains Jamie Reagan after Jamie graduates from the police academy. Gives him a hard time about being a Reagan.
Received a commendation for saving a child from a burning building, however the true hero was Jamie but recognition of the act would have blown Officer Reagan's undercover assignment and put his life in potential jeopardy.