The Linkin Park frontman died on what would have been Chris Cornell's 53rd birthday

Chester Bennington died by hanging, the L.A. County Coroner’s Office confirmed to EW on Friday.

The Linkin Park frontman hanged himself from a bedroom door and was found dead at a private residence in Palo Verdes Estates on Thursday, a spokesperson for the coroner’s office said. Bennington’s time of death is listed as 9:08 a.m. An official cause of death will be determined once an autopsy and toxicology tests are received.

“We received a call from law enforcement shortly after 9 a.m. this morning of a death in Palo Verdes Estates,” a spokesperson for the Palos Verdes Estates Police Department told PEOPLE on Thursday. “We responded to the scene and confirmed it’s Mr. Chester Bennington, unfortunately. It’s being investigated as a possible suicide.”

Mike Shinoda, Bennington’s longtime bandmate, was among the celebrities reacting to singer’s death on social media. “Shocked and heartbroken, but it’s true,” he wrote.

Bennington’s death came on the same day his late friend and fellow musician Chris Cornell would have celebrated his 53rd birthday. The Soundgarden singer died in May, also from suicide by hanging. After Cornell’s death, Bennington posted an emotional tribute, writing in part, “I can’t imagine a world without you.”

If you or someone you know is considering suicide, please contact the National Suicide Prevention Lifeline at 1-800-273-TALK (8255).