Donnie Kowalski

A Chicago police officer and Abby Kowalski's oldest brother. He was fathered by a man named "Speedo" with Sheila, prior to her meeting Don Kowalski, who subsequently adopted him. He tests for and transfers into the Chicago P.D. SWAT team. Donnie is recently divorced and has taken an interest in Abby's best friend Mackie.

Appearances