Cause of death: overdose
Adam Rich (October 12, 1968 – January 7, 2023) was an American actor. He was best known for his portrayal of Nicholas Bradford, the youngest son on the television series Eight Is Enough, which ran for five seasons (1977–1981). Known for his pageboy haircut, Rich's character on the show led him to be known as "America's little brother".
Source : Wikipedia