Sources: Nearly 50 envelopes of suspected heroin in Hoffman's apartment

Police investigating the death of actor Philip Seymour Hoffman have found close to 50 envelopes of what they believe is heroin in his Manhattan apartment, two law enforcement sources familiar with the inquiry said Monday.A number of used syringes, prescription drugs and empty bags that authorities suspect used to hold heroin also were found in the apartment where Hoffman, 46, was found dead Sunday of an apparent drug overdose on the bathroom floor with a syringe in his left arm, the sources said.The New York medical examiner's office is conducting an autopsy, according to law enforcement sources."We are devastated by the loss of our beloved Phil and appreciate the outpouring of love and support we have received from everyone," Hoffman's family said in a statement. "This is a tragic and sudden loss and we ask that you respect our privacy duringthis time of grieving."The Oscar-winning actor last talked with someone at 8 p.m. Saturday, as far as authorities have determined, a law enforcement official said.He was expected to pick up his children Sunday but didn't show up, the official said. Playwright David Katz and another person went to the apartment andfound him dead, the official said.Police officers found him in a T-shirt and shorts with his eyeglasses still on his head.Police also found several empty bags branded "Ace of Hearts" -- a street name for heroin -- in the apartment, two law enforcement sources familiar with the investigation told CNN.Also in the apartment were close to 50 envelopes, branded "Ace of Spades," containing what is believed to be heroin, the two sources said.Investigators also found in the apartment, which was leased from a friend, according to the two sources: