Philip Seymour Hoffman
Philip Seymour Hoffman after winning for Best Actor in a Motion Picture-Drama for his role in the film "Capote" at the 63rd Annual Golden Globe Awards in 2006 Reuters

Reports of Philip Seymour Hoffman’s alleged heavy drug use are now coming to the surface following his shocking death this weekend.

According to a report from Radar Online, the Oscar-winning actor’s untimely death at age 46 in New York Sunday morning allegedly comes after months of rampant drug use. “He was what we call a heavy 'red liner.' That means he liked to shoot [heroin] with a needle, but he also sniffed it daily,” a source told the publication Monday, adding that the “The Hunger Games: Catching Fire” actor was “majorly hooked” on the popular prescription drug Oxycontin.

While Hoffman had previously been open about his drug addiction, even attending rehab last May for substance abuse, the insider claims that the longtime actor’s addictions escalated in recent months, with him spending up to $10,000 per month on drugs. “Heroin is one of the cheaper drugs, but Hoff wasn’t buying the cheap stuff,” said the source, adding, “Still, to be spending 10 grand, he was using hard."

TMZ reported that Hoffman was found dead in his New York City apartment Sunday from an apparent drug overdose. According to sources, the “Capote” actor was found dead with a “needle sticking out of his left arm” and heroin in his possession.

Mimi O’Donnell, Hoffman’s longtime girlfriend and mother of his three children -- Cooper, 10, Tallulah, 7, and Willa, 5 -- commented on Hoffman’s unexpected passing Sunday, calling the actor’s death “devastating.” “We are devastated by the loss of our beloved Phil and appreciate the outpouring of love and support we have received from everyone,” O’Donnell said in a statement via Hoffman’s publicist, Karen Samfilippo, adding, “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."

According to a report from Radar Online, Hoffman first attended rehab for drug abuse in the late 1980s after graduating from New York University. The actor reportedly “fell off the wagon” in 2012 and was last known to have received medical attention for his drug use in May 2013. According to TMZ, Hoffman was treated for allegedly “snorting heroin” and abusing prescription pills.