Explosive claims ... a cold case detective has written a book claiming JonBenet Ramsey was killed by Edward Wayne Edwards. Source: News Limited
JONBENET Ramsey and Jimmy Hoffa were killed by one of the world's most prolific serial killers, an explosive new book claims.
In a new book written by former US cold case detective John Cameron, he claims convicted killer Edward Wayne Edwards was responsible for the murder of JonBenet, a child beauty queen from Colorado in 1996.
He also claims Edwards was the Zodiac killer in California in the 1960s and 70s; that he killed Chandra Levy in 2001 in Washington, D.C.; and was responsible for the murder of union boss Jimmy Hoffa who vanished in 1975.
He maintains Edwards was interviewed by the FBI in 1978 over Hoffa's murder and he fled a short time later.
Cameron said he knows some people will scoff at the claims in his book but defended it, saying this is where the evidence had led him.
"You know, there's a lot of people that look at me like, 'You're nuts, you're saying he did Jimmy Hoffa, you're saying he did Jon-Benet, you're saying he did this?' I can't help where the evidence took me, but that's just what happened."
"A lot of people are going to be skeptics, but I can't really help that. This is what he did."
The book, It's Me: Edward Wayne Edwards, the Serial Killer You Never Heard Of, sees Cameron contest that Edwards was responsible for the deaths of more than 100 people, the Great Falls Tribune reports.
Confessed killer ... Edward Wayne Edwards was sentenced to death after confessing to the murders of five people. Source: AP
Edwards died on death row in 2011 at age 77, one month before he was meant to be executed. He had confessed to killing five people in Wisconsin and Ohio including his foster son, who he murdered to claim $25,000 in life insurance.
Cameron was working for the Montana parole board when Edwards confessed to these murders.
At the time, he realised that two of the killings were similar to an unsolved case in Great Falls.
When he looked into it further, Cameron found that Edwards had arrived in the area at the time Patricia Kalitzke, 16, and Lloyd Bogle, 18 were murdered in 1956.
The manner of their deaths was also the same as that of a teen couple Edwards had confessed to killing.
"You have an admitted serial killer who was in town on the day that we have a double murder of a couple on lover's lane in 1956,' Cameron told the Great Falls Tribune .
"That's the evidence I have."
New book ... John Cameron spent four years researching killer Edward Wayne Edwards. Picture: KRTV Source: Supplied
That cold case kicked off Cameron's four-year investigation into Edwards and led him to conclude Edwards was "the worst serial killer that's ever been".
He said reading Edwards' book Metamorphosis of a Criminal meant he could place Edwards near the scene of several murders.
"The Great Falls murder was in there, and once I determined that, I decided to follow the whole book and see where else he killed, and it unravelled the worst serial killer that's ever been," he told KRTV.
Murdered by Edward Wayne Edwards ... John Cameron claims James 'Jimmy' Riddle Hoffa was one of his victims. Source: News Corp Australia
"It got to the point where it never stopped, and it just leading me and leading me."
"It (the book) basically details all the evidence of all the killings in the 66 years that he killed. There's at least nine people right now sitting in prison on his murders that are completely innocent, and they need to be released."