At least one of the four people arrested during the investigation into the death of Philip Seymour Hoffman had the Oscar winning actor's cellphone number, according to law enforcement officials.

Philip Seymour HoffmanPhilip Seymour Hoffman Riding His Bike Around Manhattan

Responding to a tipster who said he had seen Hoffman at the lower Manhattan apartment building where the four were arrested, investigators are led to believe that it is the location where the actor purchased the drugs that killed him. In searches of two apartments, police found hundreds of packets of heroin, according to the Associated Press.

However, prosecutors declined to pursue charges against one of the four individuals saying there was no evidence that he had control of the drugs or the apartment in which they were found. Two others were charged with a misdemeanor charge of possessing cocaine, though New York jazz musician Robert Vineberg is facing a felony charge of heroin possession with intent to sell.

The two charged with possession of cocaine - Juliana Luchkiw and Max Rosenblum - are neighbours of Vineberg.

"She's not a drug dealer. She's a college student," said Luchkiw's lawyer, Stephen Turano.

Rosenblum's lawyer, Daniel Hochheiser, said his client "has nothing to do with Philip Seymour Hoffman."

Philip Seymour Hoffman's body is retreieved from his New York apartment:

Investigators discovered two bags of cocaine on the pair, though found 300 packets of heroin and about $1,200 in cash in Vineberg's apartment.

So far, it has been determined that Hoffman made six ATM transactions for a total of $1,200 inside a supermarket near his home the day before his death. Investigators are examining a computer and two iPads found at the scene of the death and have recovered syringes, a charred spoon, prescription medications and a blood pressure drug.

Hoffman, 46, was found dead on Sunday (February 2, 2013) with a needle in his arm and tests found heroin in samples from at least 50 packets in his apartment in Manhattan's Greenwich Village. Tests as to the exact cause of death came back inconclusive. 

Read our rundown of Philip Seymour Hoffman's greatest movie roles.