'Private Practice': Addison Learns Of Mark Sloan's Death

“Private Practice” celebrated its 100th episode with a celebration of Pete’s life, after his fatal heart attack. The party took an even more somber turn when Addison learned the fate of her friend, Mark Sloan. Mark died on “Private Practice”’s sister series, “Grey’s Anatomy,” last week, after sustaining injuries in a plane crash. Addison broke down in tears, which Pete’s wife Violet tried to stop by starting to sing karaoke, before she broke down, too.