Although his son, Adam's body was never found, his head was found in a sewage pipe more than 100 miles away from his house.
He has written three books: Tears Of Rage, No Mercy and Public Enemies.
After the murder of his only son, Adam, he and his wife stayed together and later had three more children: Megan, Callahan, and Hayden.
In 1996, he was chosen by People magazine as one of the 50 most beautiful people in the world.
Wife, Reve, filed for divorce on August 1, 2002. However, they later reconciled and the divorce proceeding was dismissed.
He is a Irish-American.
His son, Adam, was only 6 years old when he was murdered.
His son Adam was kidnapped from a Sears department store in Hollywood, Florida
John Walsh: One missing child is one too many.
John Walsh (1) Quotes
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So this week's episode of 'Grimm' is one of the show's occasional jaunts..