Highlights from the Fifteenth Episode of Season 2 of Blue Bloods

­When a Reagan family friend, an undercover detective, is killed, Linda and the boys worry about Danny.

Interview Room

1. Interview Room

A Reagan family friend, is killed, Danny (Donnie Wahlberg) and Jackie (Jennifer Esposito) investigate on BLUE BLOODS. Photo: JoJo Whilden©2012 CBS Broadcasting, Inc. All Rights Reserved.
Investigative Process

2. Investigative Process

A Reagan family friend, is killed, Danny (Donnie Wahlberg) and Jackie (Jennifer Esposito) investigate on BLUE BLOODS. Photo: JoJo Whilden©2012 CBS Broadcasting, Inc. All Rights Reserved.
Dispair

3. Dispair

When a Reagan family friend, an undercover detective, is killed, Linda and the boys worry about Danny, as his relentless search for the killer takes a toll on his emotional state, on BLUE BLOODS. Photo: JoJo Whilden©2012 CBS Broadcasting, Inc. All Rights Reserved.
Control Center

4. Control Center

A Reagan family friend, is killed, Danny (Donnie Wahlberg) and Jackie (Jennifer Esposito) investigate on BLUE BLOODS. Photo: JoJo Whilden©2012 CBS Broadcasting, Inc. All Rights Reserved.
In The Dark

5. In The Dark

When a Reagan family friend, an undercover detective, is killed, Linda and the boys worry about Danny, as his relentless search for the killer takes a toll on his emotional state, on BLUE BLOODS. Photo: JoJo Whilden©2012 CBS Broadcasting, Inc. All Rights Reserved.
Worried

6. Worried

A Reagan family friend, is killed, and Linda (Amy Carlson) worries about Danny (Donnie Wahlberg) as his relentless search for the killer takes a toll on his emotional state, on BLUE BLOODS. Photo: JoJo Whilden©2012 CBS Broadcasting, Inc. All Rights Reserved.
Taking A Toll

7. Taking A Toll

A Reagan family friend, is killed, and Linda worries about Danny (Donnie Wahlberg) as his relentless search for the killer takes a toll on his emotional state, on BLUE BLOODS. Photo: JoJo Whilden©2012 CBS Broadcasting, Inc. All Rights Reserved.
Emotions Run High

8. Emotions Run High

A Reagan family friend, is killed, and Linda (Amy Carlson) worries about Danny (Donnie Wahlberg) as his relentless search for the killer takes a toll on his emotional state, on BLUE BLOODS. Photo: JoJo Whilden©2012 CBS Broadcasting, Inc. All Rights Reserved.
The Life We Chose

9. The Life We Chose

A Reagan family friend, is killed, Danny (Donnie Wahlberg) and Jackie (Jennifer Esposito) investigate on BLUE BLOODS. Photo: JoJo Whilden©2012 CBS Broadcasting, Inc. All Rights Reserved.