It's been 40 years since Dean "The Candy Man" Corll and two young accomplices abducted, tortured and murdered at least 29 young boys.
The bodies were buried around the Houston area.
Each victim was identified except for one.
The National Center for Missing and Exploited Children released new pictures of what he may have looked like hoping someone will recognize him.
He's being called John Houston Doe 1973.
The boy was aged 15 to 19-years-old.
He stood about 5'2", had dark brown hair and may have suffered from a minor form of spina bifida.
If you have any information on who he is call 1-800-THE-LOST (1-800-843-5678).