(Yahoo!) - The investigation into Philip Seymour Hoffman's death continues.

Four people — three men and a woman — were arrested on narcotics charges Tuesday in Manhattan and questioned about a possible link to the heroin found in the "Hunger Games" star's apartment, "The Insider With Yahoo" has confirmed. According to CBS, more than 350 bags of heroin were found in the three apartments that were searched, but none of them had the "Ace of Spades" logo on the bags similar to some recovered in Hoffman's rental apartment.


The NYPD is trying to piece together Hoffman's final hours. It was determined that the Oscar winner, who was found dead on the floor of his bathroom Sunday with a syringe in his arm, made six ATM transactions totaling $1,200 at a local grocery store the night before he was found dead.

A police official did tell the news station that the heroin recovered at Hoffman's apartment was tested and did not contain the powerful additive fentanyl, which has been linked to numerous heroin deaths recently.

Meanwhile, Hoffman's partner, Mimi O'Donnell, is making funeral preparations. On Tuesday, she released a statement announcing a private funeral service — which is expected to take place Friday — in Manhattan for family and close friends. There will be a memorial service later this month, also in New York City.

"The family wishes to thank everyone for their continued support and good wishes," said the statement, which also asked that donations "be made in Phil’s name to two charities that were very close to his heart: The DreamYard Project and the Christopher and Dana Reeve Foundation.

O'Donnell, who has three young children with Hoffman, has received a steady stream of visitors in their family home, which is a few blocks from his rental apartment, following his death. After Cate Blanchett and Justin Theroux stopped by Monday, Joaquin Phoenix, Ethan Hawke, and Bobby Cannavale were spotted visiting as well.

Hoffman had a long-time struggle with drugs and alcohol. He had said he first went to rehab and got sober when he was 22. After a period of sobriety, he relapsed last year and did a second 10-day stint in rehab last April.

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