Bobby Spillane, the 45-year-old son of legendary mobster Mickey Spillane, fell to his death from the sixth floor of his Manhattan apartment Saturday. Sources said that Bobby had been leaning out a window and calling out to his brother, Michael, when the screen collapsed. Michael looked on from across the street in horror. “Michael said he’ll never forget the thump when he hit the ground. He said, ‘That will be in my mind forever,’” a family relative told The New York Daily News. Law enforcement sources said the death is still under investigation. Spillane, who was an actor in TV shows and films including Law & Order, Rescue Me, and The Thomas Crown Affair, had just returned from a vacation with his wife.