Tragic Oscar winner Philip Seymour Hoffman will be laid to rest at a private funeral in his native New York on Friday (07Feb14).

Friends and family are expected to gather for a wake, organised by the actor's longtime girlfriend Mimi O'Donnell, on Thursday evening (06Feb14) and they will bid farewell to the Capote star the following day during a service at the Church of St. Ignatius Loyola in Manhattan's Upper East Side, according to the New York Daily News.

A host of celebrity pals and co-stars are expected to attend the memorials - Cate Blanchett, Joaquin Phoenix, Ethan Hawke, Michelle Williams and Justin Theroux are just some of the big names who have paid visits to O'Donnell and the couple's three children following Hoffman's his death from a suspected heroin overdose on Sunday (02Feb14).

Meanwhile, his The Talented Mr. Ripley co-star Matt Damon reveals he is still trying to come to terms with Hoffman's passing, because he had no idea of the extent of his friend's drug troubles.

Damon tells U.S. talk show host David Letterman he was unaware of his pal's sobriety struggle after spending more than two decades clean: "I think for people who worked with him, it didn't (show that he was struggling with drugs)... but obviously there was something going on there...

"He went into rehab after I had dinner with him, a month later, and I was as shocked as anybody to read about it so it wasn't the kind of thing that I could see (affecting him)."

And Hoffman's The Ides of March co-star George Clooney adds, "It's weird to be in New York right now because you think of him in this town, so it's very sad. I think everybody in our community is really reeling from it. It's a testament to how much he was loved but it was very sad... It's so hard to understand (his drug troubles) and I think it breaks everybody's heart."

An autopsy carried out on the 46 year old's body on Monday (03Feb14) proved inconclusive and coroners are now awaiting the results of toxicology tests to determine the cause of his death.