Petit Family murders. trial coverage, warning! graphic evidence photos.

[Lady Cop]

It could be any happy American family, but behind that young boy's smiling face is the heart and mind of a cold blooded killer.

The pictures show the Komisarjevsky family, including son Joshua as a child. RIGHT. COMPARE WITH THE PETIT FAMILY PHOTOS.

Though the revelations of his sister in court Tuesday show that Komisarjevsky had a troubling youth as well, sexually assaulting his sister for years while they were children.

His sister appeared in court on her brother's behalf- in spite of his aggressive actions towards her- in an effort to dissuade the jury from sentencing him to death.

She testified that her parents did not get counseling outside of church after he sexually abused her because they feared the state could break up the family.

The sister said her parents worried she or her brother could be removed from the home. Her testimony came in the sentencing phase of the trial of Joshua Komisarjevsky, who was convicted of killing Jennifer Hawke-Petit and her daughters in their Cheshire home in 2007. He faces life in prison or the death penalty.