Sergeant Duff is a fictional character portrayed by Thomas A. Carlin in the TV series Law & Order.
In the first episode they appeared in, titled A Death in the Family (season 1), they were 62 years old.
They appear in 1 episodes out of a total of 501 aired so far
Episodes1
A Death in the Family
episode S1.E13 january 1991A police officer is shot to death on a rooftop. Assistant D.A. Stone's investigation reveals that the officer may have been dirty.