John Slattery, the actor and filmmaker who many will know as Roger Sterling from Mad Men, is on the publicity trailer for his debut feature God's Pocket - a new drama featuring one of the final performances from Philip Seymour Hoffman. The actor - regarded as the finest of his generation - died from a heroin overdose after wrapping the movie. 

Philip Seymour HoffmanPhilip Seymour Hoffman [L] in 'God's Pocket'

The release of God's Pocket has subsequently been a bittersweet experience for Slattery, who told the Huffington Post UK, "I had compartmentalised it. When it happened [Hoffman's death], it was horrible and the movie came out in the US and I stopped talking about it. I hadn't talked about it in a long time, and it's not the experience I wanted to have."

"I'm glad I had the chance to work with him, but I wish he was here. He was meant to be here with me talking about this movie. He really loved this movie, he enjoyed it, we had a great time making it together, so it's taken a lot of the enjoyment out of it, certainly."

More: God's Pocket makes sure that we remember Philip Seymour Hoffman

More: read our review of God's Pocket

Hoffman's performance in God's Pocket is typically assured though the film itself has struggled to find any real acclaim from critics. Slattery himself admits he was nervous about how the film would be received but isn't concerned with bad reviews.

"...if everyone told you they loved everything you did, you'd just stop," he said.

God's Pocket, also starring Christina Hendricks and John Turturro, is out in the UK now. 

Watch the God's Pocket trailer: