About Blue Bloods Season 8, Episode 4 : Out of the Blue

Danny and Baez work the case of a detective who was gunned down prior to testifying against a career criminal. Also, Frank personally investigates when Garrett is attacked by a SWAT team outside his home, and Erin brings in a confidential informant against Anthony's wishes. Guest Stars: Steve Schirripa, Gary Lee Mahmoud, Jake Ventimiglia,