Eric Christian Olsen, who starred as Marty Deeks on NCIS: Los Angeles for 14 seasons, is officially returning to the NCIS franchise. But not how you might think. This time, he will be working behind the scenes rather than playing his fan-favorite character on-screen. According to Deadline, Olsen has signed on to serve as an executive producer for the upcoming third season of CBS’ NCIS: Origins under his banner Cloud Nine Productions.