Guy Rivera, 34, was charged Thursday with first-degree murder in Diller’s death. He had 21 prior arrests and was on parole until last year after serving a five-year prison term on a drug conviction.

David Pierson. Pierson was Diller's direct supervisor on the NYPD's vaunted community response team, which now has a new mission: to watch forever over Diller's wife Stephanie and their one-year ...