In the days before he took part in on of the most horrific murders in Connecticut history, Joshua Komisarjevsky spent his time surfing hundreds of porn sites, according to his mother, RadarOnline.com has learned.

The convicted triple murderer is currently beginning his second week in court for the penalty phase of his trial as a New Haven, Connecticut jury decides if he spends the rest of his life in jail or joins accomplice Steven Hayes on death row.

As RadarOnline.com previously reported, Komisarjevsky was found guilty of 17 counts on October 13 for the grisly murders of Jennifer Hawke-Petit and her daughters, Hayley, 17, and Michaela, 11, and the vicious beating of their father, Dr. William Petit, on July 23, 2007.

The death penalty trial of the convicted Petit family murderer Joshua Komisarjevsky took a dark turn on Friday as his troubled teenage years were revealed in graphic detail, RadarOnline.com has learned.

Equally as disturbing is what may happen in the days to come if the killer's nine-year-old daughter is called to testify, as jurors decide whether her father spends the rest of his life in prison or is put to death by lethal injection.

PHOTOS: Petit Family Murderer’s Transformation From Super Cute Kid To Cold Hearted Killer

As RadarOnline.com previously reported, Komisarjevsky was found guilty of 17 counts on October 13 for the grisly murders of Jennifer Hawke-Petit and her daughters, Hayley, 17, and Michaela, 11, and the vicious beating of their father, Dr. William Petit, on July 23, 2007 in their Cheshire, Connecticut home.

Dr. William Petit has been a constant sight in court since his wife and two daughters were murdered during a horrific home invasion in 2007, but it was convicted killer Joshua Komisarjevsky's father who took the stand on Wednesday, RadarOnline.com has learned.

For the second day of the penalty phase of the triple murderer's trial that will decide if he spends his life in prison or is senteneced to death, the defense called Ben Komisarjevsky to testify in support of his adopted son, reported the New Haven Register.

As RadarOnline.com previously reported, Komisarjevsky was found guilty of 17 counts on October 13 for the grisly murders of Jennifer Hawke-Petit and her daughters, Hayley, 17, and Michaela, 11, and the vicious beating of their father on July 23, 2007.