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Adam Ridge, known for his role as Nicholas Bradford on the TV show "8 Is Enough," has died at the age of 54.

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The cause of his death is under investigation but not considered suspicious.

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Rich had a limited acting career after the show and struggled with drug and alcohol-related issues, seeking treatment at the Betty Ford Center.

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He battled a type of depression that proved challenging to treat, openly discussing mental illness to fight its stigma.

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Rich emphasized the strength it takes to battle mental illness, urging others never to give up.

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He gained fame as America's Little Brother, with distinctive pageboy mob top haircut.

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Rich made occasional appearances, marketed script ideas, and had roles in other TV shows and commercials.

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His last credited role was playing Crocodile Dundee on Real Comedy in 2003.

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Rich's life was marked by personal challenges, including an arrest for attempted burglary and struggles with substance abuse.

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Despite his struggles, Rich was remembered as a   kind, generous, and loving individual by those close to him.