Aaron Carter, the former child star who gained fame as a singer, rapper and actor, was found dead Saturday at his Southern California home at age 34. Los Angeles County Sheriff's Department had responded to a call for help and said they found a deceased person at the scene.

Authorities have yet to provide a possible cause of death. Multiple reports have cited sources that said Carter was found unresponsive in his bathtub at his home in Lancaster, California.

TMZ reported that Carter's housekeeper had been heard screaming over the police scanner after discovering his body. TMZ also reported that sources said investigators would look into Carter's past drug use.

Carter had reportedly been in rehabilitation at least five times. In September, Carter enrolled in a rehabilitation facility to help him regain custody of his toddler son, Prince.

In 2017, Carter was arrested in Georgia under suspicion of driving under the influence and marijuana possession. In a 2019 appearance on "The Doctors," a daily syndicated talk show that involves experts providing medical advice, Carter disclosed that he had been diagnosed with both schizophrenia and bipolar disorder.

Carter's brother, Backstreet Boys member Nick Carter, posted a heartfelt tribute to his younger brother on Instagram Sunday morning.

Aaron Carter's older brother, Nick Carter, posted a heartfelt tribute to his younger brother on Instagram Sunday morning.

"Even though my brother and I have had a complicated relationship, my love for him has never ever faded," wrote Nick Carter. "...Sometimes we want to blame someone or something for a loss, but the truth is that addiction and mental illness is the real villain here."

Aaron Carter gained fame in the 1990s after his self-titled album sold a million copies. The album was released when he was 9 years old. It led to appearances on Nickelodeon and Disney Channel, culminating in his performance of his biggest hit "I Want Candy" on Disney's "Lizzie McGuire."