Vigilante by Stephen J. Cannell

Abridged audio. A fun and light entry into the Shane Scully series. PW: Lita Mendez was a thorn in the LAPD's side. An aggressive police critic and gang activist, she’d filed countless complaints against the department. So when she's found dead in her home, Detective Scully and his partner Hitchens fear the worst: that there's a killer in their ranks. Outside the crime scene, Nixon Nash and his television crew have set up shop. Nash is the charismatic host of a hit reality show called "Vigilante TV," dedicated to beating the cops at their own game: solving murders before they can. Now he has the murder of Lita Mendez in his sights. He presents the detectives with a choice: either join his team, or prepare for a public takedown.