The O.C.' premiered, Peter Gallagher still worries about Mischa Barton, who he said he's "always" been "very protective of"

Peter Gallagher is “grateful” Mischa Barton is “still alive.” The 69-year-old actor spoke about Barton, who was his co-star in “The O.C.,” revealing the level of fame she was dealing with at an early age “can kill you.”

The actor, who played Sandy Cohen in the hit teen drama, recently opened up to The Independent about the negative impact of fame and how he always found himself looking out for Mischa Barton, who played Marissa Cooper on the show centered on wealthy teens living in Newport Beach, California.