Reports suggest the Hunger Games star died of an drug overdose in the bathroom of his flat.The body of the 46-year-old was discovered on Sunday morning in the West Village area of Manhattan."He was found dead in his bathroom of an apparent drug overdose," an NYPD spokesman said.Police were called to the scene by a friend of the actor, the spokesman said.Hoffman was discovered with a syringe in his arm and "there was heroin found at the scene", the police official added.The actor won the Academy Award for Best Actor for the 2005 film Capote, after starring in films including Boogie Nights and the Big Lebowski.Speaking at the London Critics' Circle Film Awards in central London, John Hurt - who starred with Hoffman in 2003 film Owning Mahowny - said: "It's a devastating loss. His contribution was massive."Meanwhile a number of celebrities have taken to Twitter to pay their respects to the actor.Co Down actor Jamie Dornan said: "Simply rotten news about Philip Seymour Hoffman. Stunning actor and by all accounts a wonderful man. Thoughts are with his loved ones."Lord of the Rings star Sean Astin said: "I'm so sad to read about Philip Seymour Hoffman Obviously, prayers for his family and friends. He was a Pure Actor and I will miss his talent."Actor and presenter Stephen Fry wrote: "Oh no, I've just heard the news of the death of Philip Seymour Hoffman. What a blow to the industry & most of all of course to his family."Comedian Ricky Gervais added: "Such shocking & sad news. RIP Philip Seymour Hoffman. One of the greatest actors of a generation and a sweet, funny & humble man."The actor leaves behind his long-standing partner and costume designer Mimi O'Donnell and their two daughters and son.Hoffman's family said in a statement: "We are devastated by the loss of our beloved Phil and appreciate the outpouring of love and support we have received from everyone."This is a tragic and sudden loss and we ask that you respect our privacy during this time of grieving. Please keep Phil in your thoughts and prayers."Hoffman had admitted struggling with drug addiction in the past but had reportedly been clean for 23 years before a relapse last year. He had checked into rehab in May for heroin use.The Office of Chief Medical Examiner will investigate the exact cause of death.