Why Do Some Women Kill?

But when he sees his daughter's mug shot on television and hears the crimes she's accused of he doesn't see the woman he raised.

"The young lady I see on film – that's not my daughter," Lawless said.

Huckaby had also been in trouble with the law. When she was arrested Friday night on kidnapping and murder charges, after six hours of questioning, she was on probation for theft.

Huckaby does not have any history of violent behavior, Sheneman said, adding police are confident that she acted alone.

Huckaby remains in police custody and is due to be arraigned in court today.

Police said that when Cantu was captured on a surveillance camera, happily skipping down the street, she was on her way to play at Huckaby's home. Sheneman said police believe the 8-year-old was killed "very soon after she was seen on the video."

Dr. Michael Welner, a forensic psychiatrist and chairman of The Forensic Panel, told "Good Morning America" today that the arrest of a woman in a murder such as Sandra's is "really strange and peculiar."

"There's more to the story," he said. "And instinct tells me to sit back and let the case come to all of us."

Welner said there are a "whole range of possibilities" that could have led to Huckaby's arrest.

"The possibilities are she is as horrible as everybody imagines," Welner said. "Or she could have gotten in over her head in an interrogation and gave statements that incriminated herself in a way that are actually inaccurate."

Welner said women are statistically less likely to murder than men in part because "destruction and the ability ... use power to knock someone down is so tied into a masculine identity."

"That's not part of what makes women feminine in this culture or in any culture," he said.

Though there is no single profile of female killers, mental illness has played a part in many of their high-profile killings.

According to Jack Levin, a criminology professor at Northeastern University, female killers are more likely than men to suffer from serious mental illness, while male killers more typically suffer from personality disorders, and are often sociopaths who are unable to empathize with their victims.

Andrea Yates, a Houston mother who drowned her five children in 2001, was found not guilty by reason of insanity and sent to a state mental hospital. Her attorneys argued that she suffered from severe postpartum psychosis, believed Satan was inside of her, and was trying to save her children from hell.

Women Less Likely to Use Extreme Violence

"There are a number of different roads that lead to someone taking someone else's life," said Xavier Amador, a clinical psychology professor at Columbia University. "In women, in my experience, it tends to be typically related to a history of abuse or psychosis."

Women are also less likely to use a violent means of killing or to plan out their attacks, psychologists say. Though women account for roughly 10 percent of all homicides, they are involved in 36 percent of poisonings, according to the Justice Department.

Stacey Castor was sentenced to 25 years to life last year for poisoning her husband David Castor with antifreeze, and to another 25 years for the attempt to kill her daughter Ashley Wallace, then 20, with an overdose of drugs and vodka in September 2007.

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