Philadelphia street musician Anthony Riley's death has been ruled a suicide, ET can confirm per the Philadelphia Medical Examiner's Office.
Riley, 28, was reportedly found in the basement of his apartment building in Center City. The Examiner's office confirmed he hanged himself.
PHOTOS: Stars We've Lost In Recent Years
Following the news of Riley's death, Voice host Carson Daly shared his thoughts on Instagram, writing, "Praying for the family and friends of Anthony Riley today. It's a heartbreaking loss. He was incredibly talented and loved to sing. God Bless him."
Riley, who was mentored by Pharrell, famously had the fastest four-chair turnaround by judges in the show's history while performing James Brown's "I Got You (I Feel Good)."
WATCH: Behind the Scenes of 'The Voice': Babies, Bickering and Blake
Despite being a frontrunner to win season 8, Riley had to leave the show early due to substance abuse issues, telling an interviewer that NBC paid for his rehabilitation.
Updates to follow.