Patrick Doherty

6x17 Officer Down
Doherty has his former driver Pete McGinley, now a detective in Internal Affairs, investigate Will Jeffries for corruption. After Jeffries is shot, Stillman provides evidence clearing Jeffries' name, and threatens to "beat the ever-loving crap" out of Doherty if he ever goes after someone under Stillman's command again.

7x02 Hoodrats
Doherty is appointed to oversee the detectives bureau, making life harder to Stillman and forcing big budget cuts.

7x03 Jurisprudence
Doherty tries to force Stillman to close the current case because of his ties to Judge Harold Alvarez and makes Miller transfered out of homicide.

7x17 Flashover
Doherty tells Stillman why he's holding a grudge: he locked up his troubled son Matt, who had to do jail time. He confesses it was the good thing for Matt in the end and advises Stillman to behave similarly with Vera.

7x22 Shattered
Doherty covered his son Matt's role in a murder in 1993 by having Joe Mueller make statements in the original case disappear. He is not seen arrested but he is likely to face charges/suspension.