Known for "grace under pressure," the journalist's career included coverage of Northridge quake, O.J. trial and Michael Jackson's death.
Spence, 80, died at his home Tuesday morning from an apparent heart attack, city officials said.
From a Hollywood family, his father was the screenwriter behind “Citizen Kane” and his uncle directed "All About Eve" and other classics.
Gatto was found shot to death in his Silver Lake home last Wednesday.
King was found dead in his pool at his home in Rialto early Sunday morning.