Timothy Marcia is a detective with the Open-Unsolved Unit of the Los Angeles Police Department's Robbery-Homicide Division, and the partner of Rick Jackson. He formerly worked as an investigator with the Hollywood Division homicide unit. In April 2004 he received a call from Harry Bosch in regards to cases Terry McCaleb had worked on for LAPD in the last few years. Marcia told Harry that the Chief had instituted a new program under which officers who had retired within the past three years could return to active duty without going back through the academy. Marcia told Bosch they especially need him in the Open-Unsolved unit because they had 7,000 unsolved cases.