Published: Dec 07, 2012 5:14 PM EST
Updated: Dec 07, 2012 6:26 PM EST

"You pull the bolt back, it feeds a cartridge into the chamber area of the barrel," said Stephanie Steward, FDLE forensics supervisor.

FDLE forensics supervisor, Stephanie Stewart, showed a Collier County judge how a Remington .22 caliber rifle works. This type of gun was just one of five that belonged to the teen's father, Christopher Rowles. During Friday's testimony, Collier County Sheriff's Deputy Thomas Horsman testified he was first on the scene and saw Kelly Rowles on the floor.

"She was laying on her back in front of a chair, appeared unconscious to me. I started giving her chest compressions," said Deputy Horsman.

And Corporal Kevin Ward, the acting supervisor that day, said the teen asked if she was okay.

"He asked me if his mom was dead, and I told him yes," said Corporal Ward.

Attorneys for the state and defense spent hours questioning Crime Scene Investigator Alicia Craig about the layout of the Fiddler's Creek home, showing photos of the family's living room at the time of the shooting Craig told the court Kelly Rowles was shot in the upper left temple. She added that because of the layout of the house, the teen would have been unable to see Rowles from all parts of the living room.