Treat Williams guest stars as Lenny Ross in the May 12 episode of Blue Bloods which is called “Irish Exits.” Here’s how the episode is described.

Frank worries about his longtime friend Lenny Ross (Treat Williams) when he suspects the former officer is hiding his true reason for returning to the city. Also, Danny and Baez investigate when Baez and her daughter are targeted by a criminal Baez once put away; Eddie gives her partner, Badillo, relationship advice when his ex-girlfriend is physically attacked; and Anthony is sucked into the inner workings of an underground crime ring when his chaotic cousin, Joey, begs him for a favor, on BLUE BLOODS, Friday, May 12 (10:00-11:00 PM, ET/PT) on the CBS Television Network, and available to stream live and on demand on Paramount+*. Treat Williams returns as Lenny Ross, Frank’s longtime friend.

“Irish Exits” – Frank worries about his longtime friend Lenny Ross (Treat Williams) when he suspects the former officer is hiding his true reason for returning to the city. Also, Danny and Baez investigate when Baez and her daughter are targeted by a criminal Baez once put away; Eddie gives her partner, Badillo, relationship advice when his ex-girlfriend is physically attacked; and Anthony is sucked into the inner workings of an underground crime ring when his chaotic cousin, Joey, begs him for a favor, on BLUE BLOODS, Friday, May 12 (10:00-11:00 PM, ET/PT) on the CBS Television Network, and available to stream live and on demand on Paramount+*. Treat Williams returns as Lenny Ross, Frank’s longtime friend. Pictured: Marisa Ramirez as Det. Maria Baez and Donnie Wahlberg as Danny Reagan. Photo: CBS ©2023 CBS Broadcasting, Inc. All Rights Reserved. Highest quality screengrab available.

“Irish Exits” was written by Kevin Riley and directed by Ralph Hemecker.