The Wall Street Journal has the first word:
Award-winning actor Philip Seymour Hoffman was found dead Sunday afternoon in his New York City apartment, a law-enforcement official said.
The New York Police Department is investigating, and the Office of the Chief Medical Examiner to determine exact cause of death. The official said Mr. Hoffman, 46 years old, was found dead at his apartment at 35 Bethune St. in the West Village neighborhood of Manhattan.
In one of his most recent films, God's Pocket, which played at this year's Sundance, Hoffman plays a father from South Philadelphia who searches for answers following the death of his son.
UPDATE: The man who found Hoffman dead was David Bar Katz, son of notorious Philadelphian Harry Jay Katz.