The teenager who allegedly used a claw hammer to bludgeon his parents to death twice confided in his best friend that he intended to kill them, but the friend dismissed the comments because the teen had made such threats before, according a police affidavit released today.
The suspect also told a friend that he attacked his parents, Mary Jo and Blake Hadley, after taking a large dose of the drug ecstasy.
Details of the double murder emerged as Tyler Hadley's attorney Mark Harllee filed a not guilty plea. Hadley is currently being held at the Port Lucie County jail in Florida.
Hadley has confessed to killing his parents, police said. He then threw a boozy party for about 60 friends while the bodies of his parents laid in a locked bedroom.
During the party, Hadley pulled his best friend Michael Mandell aside and told him that he killed his mother and father.
When Mandell didn't believe Hadley, "Tyler pointed out both his parent's vehicles were still in the driveway," according to the affidavit.
He wasn't convinced until Hadley took Mandell to the master bedroom where Mandell saw a man's leg and recognized Blake Hadley's shorts.
Hadley told his friend, who he has known since they were 8, that "he stood behind his mother while she was at the computer and thought about killing her for about five minutes. Then he decided to strike his mother in the back of the head with a hammer."
After the initial blows, Hadley said that his mother turned to him and asked, "Why?"
Hadley's father came out of the bedroom when he heard his wife scream.
"Tyler told MM [Mandell] that he and his father stared into each other's eyes for a minute. Tyler said he then went after his father and murdered him," the affidavit states.
Mandell said Hadley took his parents' cell phones and put them in his bedroom so that they couldn't get to them and took one of their credit cards, so he would have access to their money.
It took the teenager about three hours to mop up the blood, he allegedly told Mandell, before his friends arrived for the party.
According to the affidavit Mandell told police Hadley was going to take 10 Percocet pills and kill himself, but the police showed up instead.
It was Mandell who called police to alert them to the murders. When they arrived at the home they found Hadley glassy eyed and talkative. When the boy said they couldn't come in, the police entered anyway on the possibility that someone inside could be in danger.
The officers found the parents' bodies in a locked bedroom beneath furniture that had been piled into there from other rooms in the house, the affidavit said.
Mandell told television station WPTV that Hadley had taken three ecstasy pills and didn't believe his friend's confession until he saw the father's body.
"After he told me I didn't believe him, because he's been my best friend forever I would never suspect anything like this," he told the station.
Mandell's mother, Michele Mandell, told ABCNews.com that she had known Hadley for nearly a decade. Tyler Hadley, she said, was a "great kid."
Dr. Julie Holland, an assistant professor of psychiatry at New York University who has studied ecstasy, said, "It is absolutely not known to cause violent reactions."
The tablets Hadley allegedly took may have been sold as ecstasy, Holland said, but could have been anything.
Teen Told Friend He Would Kill His Parents
"He could have been having a first episode psychotic break that was made worse or triggered by ecstasy," according to Dr. Cindy Kuhn, a neuropharmacologist at the Duke University Medical Center.
Most people assume ecstasy causes euphoria, explained Kuhn. Although that is true in small doses, she said, larger doses -- such as the three pills Hadley allegedly took -- can produce high blood pressure and increased anxiety.
"You'd expect somebody to maybe be very activated -- running around -- more aroused and alert," Kuhn said.
When police arrived early Sunday morning in response to the tip they received that Hadley's parents had been murdered, Hadley appeared "nervous, frantic and very talkative," according to the affidavit.
Hadley's age, 17, is a "prime age to go crazy," Holland said. In the late teens and early 20s the brain is very vulnerable, she explained. That's typically when people develop schizophrenia or manic depression, she said.
In patients with schizophrenia, for example, a drug like ecstasy can trigger an episode, Kuhn said. It's unknown if Hadley suffered from psychological illness.
Port Saint Lucie police spokesman Tom Nichols could not disclose if investigators found drugs in the Hadley home.