John Walsh

Almost 30 years after the murder of the son of America's Most Wanted host John Walsh, new evidence shows that infamous serial killer Jeffrey Dahmer may have killed the 6-year-old boy, an investigation by The Miami Herald suggests.

Several witnesses, who were interviewed about Adam Walsh's abduction from a Hollywood, Fla., mall on July 27, 1981, say Dahmer was not only at the mall the day of the abduction, but that he was seen with Adam that day.

Several witnesses said Dahmer had access to a blue van that fit the description of the getaway car, and one witness claimed he saw Dahmer force a crying boy into the back of a blue van. At the time of Adam's murder, Dahmer was living in nearby Miami Beach.

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Detectives questioned Dahmer about the case, and took him at his word when he said he had "nothing to do with it."

Adam's severed head was found on Aug. 10, 1981, some 120 miles away from the mall where he was abducted. The rest of his remains were never found.

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Ottis Toole was officially named Adam's killer in 2008, after confessing to the murder on his death bed in 1996. Toole had confessed to the crime a number of times starting in 1983, but he repeatedly recanted those confessions. Over the years, Toole took responsibility for more than 200 homicides — many of which, it was discovered, he had nothing to do with.

Dahmer was arrested in 1991 on charges of decapitation, necrophilia and cannibalism after 11 severed heads were found in his Milwaukee apartment. He later confessed to those murders, as well as six others. He was bludgeoned to death by a fellow inmate in prison in 1994 at age 34.

Oscar nominee Jeremy Renner (The Hurt Locker) starred in the 2002 movie Dahmer.

John Walsh would go on to lobby for new laws for missing children in 1982 and 1984. He also launched America's Most Wanted in 1988, which has since led to 1,100 captures as of January. He did not comment on the Herald's report.