(CNN) — 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 will conduct an autopsy Monday, 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 during this time of grieving.”

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