Adam Rich, who rose to fame as a child star on ABC’s “Eight Is Enough,” has died at age 54.

The actor died Jan. 7, according to records from the Los Angeles County Medical Examiner-Coroner. No cause of death has been determined.

Rich’s publicist Danny Deraney remembered Rich in a statement as “simply a wonderful guy.”

“He was kind, generous and a warrior in the fight against mental illness,” Deraney tweeted. “Adam did not have an ounce of ego. He was unselfish and always looked out for those he cared about. Which is why many people who grew up with him feel a part of their childhood gone, and sad today.”

Rich’s representative concluded: “He really was Americas Little Brother.”

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TMZ was the first to report Rich’s death, citing a family member. 

Rich, known for his wide grin and pageboy haircut, found TV fame portraying youngest son Nicholas Bradford on “Eight Is Enough” from 1977 to 1981. The show revolved around Dick Van Patten, who played a newspaper columnist (inspired by the life of journalist Tom Braden, who died in 2009) and father of eight kids. 

Rich also starred in the shows “Code Red,” “Dungeons & Dragons,” “Baywatch” and more. In 2003, the actor made a brief cameo in David Spade’s movie “Dickie Roberts: Former Child Star.” 

Rich’s last tweet was a retweet of his own post in September, discussing mental health. “Human beings weren’t built to endure mental illness. The mere fact that some people consider those to be weak, or have a lack of will is totally laughable … because it’s the total opposite!” he wrote. “It’s takes a very, very strong person … a warrior if you will … to battle such illnesses.”