NEW YORK (CBSNewYork) — As police continue to gather evidence in the murder of 8-year-old Leiby Kletzky, investigators are forming a more comprehensive profile of their suspect, Levi Aron.

Aron has been ordered to undergo a psychiatric evaluation by a judge. The 35-year-old pleaded not guilty to murder and kidnapping charges on Thursday in connection with Kletzky’s death.

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Police say part of the boy’s dismembered body was found in Aron’s freezer in his Brooklyn apartment. The rest of his body was found in a Dumpster about two miles away.

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“Nobody knows what’s going on. I’m just now finding out information and I’m in total shock,” said Aron’s ex-wife Debby Kivel immediately after his arrest.

But according to the New York Post, a 2006 protective order she filed not long before their divorce in Tennessee sheds new light on the Brooklyn man’s mindset.

In the order, Kivel says after they were separated, Aron warned that “if she did not have sexual relations with him, then he would kill himself, period.” 

Aron also allegedly left her “100 phone calls and numerous text messages.”

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He also allegedly threatened to have her kids taken away and “…struck her with a closed fist on her shoulder and on her stomach.”

Kivel also said her ex-husband, after they were already separated, snuck into her bedroom and asked her if she would have sex with him.

Kivel says she refused but woke up with her bra off and Aron in her bed.

Aron’s lawyer says his client may be mentally unstable, claiming he hears voices.

We now know that Aron’s marriage to Kivel was not his first. Court records show three years earlier in 2004, he married an Israeli woman and divorced a year later.

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If convicted of killing Leiby Kletzky, what is the appropriate punishment in this case? Do you think Levi Aron is insane? Sound off in our comments section.