The casket carrying actor Philip Seymour Hoffman The casket carrying actor Philip Seymour Hoffman

Roughly 400 friends and family attended Philip Seymour Hoffman's funeral on Friday in New York, People reports.

Among those in attendance at the Church of St. Ignatius Loyola in Manhattan were his former co-stars Cate Blanchett, Michelle Williams, Amy Adams, Laura Linney and Julianne Moore. Spike Lee, Meryl Streep, Justin Theroux, Joaquin Phoenix and Ethan Hawke were also there to mourn the actor alongside his partner Mimi O'Donnell and their three children.

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The Oscar-winning actor was found by a friend on the bathroom floor of his apartment Sunday morning with a syringe in his arm. He was pronounced dead at the scene. No cause of death has been determined because an autopsy has come back inconclusive, and police are still currently investigating. Approximately 50 bags of heroin and other drug paraphernalia was found in his apartment. Additional tests, including a toxicology report, will be performed, but may take weeks to receive results.

A large memorial service is expected later this month.