He is portrayed by Wayne Knight and works as a Police Sergeant in the fictional town of Rutherford, Ohio, though he is consistently referred to as "Officer" throughout the series.

Don is known to make blunders, for example, in Stuck With Dick, when he thinks Mary's house has been broken into, he bursts in through the front door shouting "Ass right there, freeze hole!

"[2] In Dick's Big Giant Headache, Part II, he also claims to be always losing things, adding "I even lost a whole dead guy once”.

[3] As the final season draws to a close, he hides in a frozen food freezer during the robbery of a local store, admitting that he is a coward who only joined the police force because he thought he'd be safe around all the other officers.

Officer Don has a hidden musical talent in the form of being a first-class singer, of a wide vocal range and style.