[s6e11] Back — In The Day

: Played by guest star Treat Williams , who becomes a recurring character throughout the series.

: Erin investigates the murder of a detective assigned to the DA’s office, uncovering a pattern of witness intimidation and killings linked to an ongoing case. [S6E11] Back in the Day

The query refers to which is the 11th episode of the sixth season of the police procedural drama Blue Bloods . Plot Overview : Played by guest star Treat Williams ,

: At home, Danny discovers that his son, Jack, is being bullied at school. Linda tries to manage Danny's reaction, knowing he might overreact to the situation. Notable Cast & Characters Plot Overview : At home, Danny discovers that

In this episode, Frank Reagan's leadership is tested when his former partner, Lenny Ross, decides to publish a tell-all book about their early years on the force. The book threatens to expose potentially damaging details about Frank's past, leading to a conflict between Frank's loyalty to an old friend and the need to protect the NYPD's reputation.