The Reagans came together to protect New York City in the epic and emotional Blue Bloods series finale ... which includes Erin asking her ex-husband, Jack Boyle (Peter Hermann), to pull a few ...

He's hotshot lawyer Jack Boyle on Blue Bloods, and a high-priced defense attorney on Law and Order: Special Victims Unit, but Peter Hermann has appeared on more than a few memorable series.

Jack Boyle (Peter Hermann), regarding her run for District Attorney, on the thirteenth season premiere of BLUE BLOODS, Friday, Oct. 7 (10:00-11:00 PM, ET/PT) on the CBS Television Network.

“Our dinners are never about the food,” proclaims NYPD Commissioner Frank Reagan (Tom Selleck) near the end of Blue Bloods‘ final episode ... telling everyone that she and her ex-husband Jack Boyle ...