The multiple killer, who is now behind bars at the Western Correctional Institution, a maximum-security facility in Cumberland, Maryland, had begun confessing to a cellmate in 2000. He believed the man, who had long hair and a bushy beard, was Jesus, according to a Cape Cod Times story published at the time.
The Clark brothers, born respectively in 1950 and 1952, grew up in the upper-middle class hamlet of Warren, New York, with two other siblings. The family shared a two-story colonial house buried in several acres of woods.
Their father, Hadden Clark Sr, was a Korean War veteran and an engineer at a gasoline company. His wife Flavia was a homemaker.
Hadden, according to one of his childhood friends, had a quick temper. 'Sometimes, he couldn't control himself. If something didn't go his way, he'd get very upset. All the kids would walk away and wait for him to calm down,' Toni Munzipapo once told the Washington Post.
Bradfield in 1984 began the brother's crime record by inviting Trish Mak, his married co-worker, to his house for dinner.
Mak's husband couldn't come so she came to the Los Gatos, California home on her own. There, Bradfield tried to woo her, unsuccessfully. He then bashed her head against a concrete block, strangled her and cut her body, according to Daniel Diehl and Mark P Donnelly's book Eat Thy Neighbour: A History of Cannibalism.
Bradfield, the authors wrote, cut up Mak's breasts, cooked them on his barbecue grill and ate them.
He then tried to commit suicide before confessing in hospital, telling officers: 'She's in the trunk of my car.' Bradfield received an 18 years to life sentence and remains incarcerated at California State Prison Solano.
Hadden meanwhile had acquired a degree from a culinary institute, and later worked at restaurants, where his co-workers said he sometimes drank blood that drained from beef meat.
Other jobs included working as a roller-blade delivery man, and at Whatsa Bagel in Northwest Washington. He eventually became homeless and lived in his pickup truck.
A Navy psychiatrist diagnosed Hadden with paranoid schizophrenia in 1985, leading to Hadden's discharge.
A former landlord of Hadden filed charges against him in 1988. Hadden was convicted of defacing the Bethesda property by hiding fish heads in the piano, in the stove and in the chimney, in addition to setting up a booby trap on the door.
'His lifestyle is getting even,' the landlord told the Washington Post. 'We feel scared. He told us about getting even with other people.'
The following year, Hadden was convicted of stealing women's purses at a Bethesda church while they were at choir practice. Detectives said he told them: "I'm a woman" during interrogation.
Hadden told a psychiatrist at the Department Of Veterans Affairs, according to the Washington Post: "I think I have a split personality. I don't like to hurt people, but I do things I'm not aware of."
Houghteling, a Harvard graduate, went missing from her home in Bethesda in October 1992. Hadden had worked as a part-time gardener for her family.
A bloody fingerprint on her pillowcase led investigators to Hadden, who eventually confessed to her murder.
"I found Laura, alone, in her bedroom," he told the court.
"I killed her by means of suffocation while she lay in her bed. I removed her from the home and buried her.
"I suffered no delusions at the time of this crime and committed the crime of my own free will," he added according to the Washington Post.
Houghteling's throat was slashed when she was found. Hadden told investigators she was in a grave close to her home.
Hadden received his first 30-year sentence for Houghteling's murder. The second came after detectives noticed he was in the area when six-year-old Michele disappeared from her father's home on Memorial Day 1986.
The little girl had been playing in a pool, wearing a pink bathing suit. Authorities once suspected the father, who confessed to the killing but later recanted.
Hadden eventually admitted he had killed her and drunk her blood, according to Adrian Havill's book Born Evil: A True Story Of Cannibalism And Serial Murder.
Hadden received an additional 30-year sentence for the murder and the following year led authorities to Michele's remains.
Police hasn't found any additional bodies linked to Hadden's claims that he made more victims.
Authorities, Hadden and the cellmate to whom he made confessions scoured five states, looking for more remains - unsuccessfully.
An investigator once told the Cape Cod Times, after Hadden's second conviction, that the killer 'wanted to become the women and girls he killed', and that he 'consumed them quite literally'.
Investigators did find a bucket of jewelry buried under a property belonging to the Clark family.It contained hundreds of times, some of which belonged to Houghteling.
