Lafferty, he said, has no ability for linear thinking, and when he goes off track, he relies on others to get him back. And even when he's back on track, the goal isn't met, he said.
"There's no behavioral technique to fix this problem," said First, a Columbia University professor.
After being shut out from Thursday's hearing, Brenda Lafferty's younger sister Sharon Weeks attended Friday.
"It's nothing I haven't heard before," she said afterward, estimating she has attended as many as 30 hearings over the years. "I'm fairly confident the outcome will be the same as in the past."
A federal appeals court overturned Lafferty's conviction in 1991 because the wrong standard was used to determine his mental competency for trial. He underwent another round of psychological assessments and a state judge found him able to stand trial again in 1996.
A jury again convicted him and sentenced him to die. Lafferty chose death by firing squad.
"I would like to see Ron Lafferty fulfill the sentence that was handed to him," Weeks said. "Yes, execution."
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