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Criminal minds: Inside the psyche of an accused killer

(WPEC)

Sheila Keen-Warren's charges expose a secret past.

Yet the 54-year-old's mugshot shows an unassuming, seemingly happy middle aged woman.

Authorities say the suspect in the unsettling cold case Clown Murder has been living a normal life, running a restaurant in Tennessee.

Dr. Laurence Miller, a pyschologist who is often used as an expert witness, explains how a killer could blend in, disappear and may never act violently again.

A person can rationalize a murder and convince themselves they did what needed to be done, according to Miller.

"We don't like to recognize the fact that there are some people in this world who were born without or have lost their sense of conscience," Miller said.

Miller is not surprised Keen-Warren in the 1990 Clown Murder of Wellington may have been motivated by love.

The Palm Beach Sheriffs Office says Keen-Warren and the victim's husband, Michael, have been living together as a married couple for decades.

Investigators said they were having an affair at the time Marlene Warren was fatally shot by a clown who knocked on her door.

"You have to have that kind of narcissistic psychopath-like personality style that allows you to justify killing somebody else, because you want their husband," Miler said. "She told herself she deserves to have this man more than the other woman."

Dr. Miller also added that once a person gets to their goal, they no longer need to be violent.

As for warning signs, Miller says there could have been none at all.

"It is possible this woman never committed a crime before, she might've never felt the urge or the impulse to do this before -- this may be a one shot crime for this woman," he said.

CBS12 asked Miller if he is surprised the prime suspect is a woman, since statistics show that men are much more violent.

Could a woman stomach pulling the trigger, taking a mother from her children, then calmly driving away?

"Well most women would not, but this is not an isolated case," Miller said. "We had the Amy Fisher case back on Long Island decades ago."

Fisher, who history remembers as "Long Island Lolita," served seven years before she was granted parole in 1999.

She famously told interviewers she had no sympathy for her victim.

There was an extramarital affair in that case as well.

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