Dr. Wayne Carver, the medical examiner took the stand for the second day to testify about autopsies on the three victims.
As he took the stand on Thursday, Carver said that Hayley walked through fire, lost consciousness and died from smoke inhalation. Her body was found at the top of the stairs of her burning home when first responders entered the Petit home.
Steven Hayes and Joshua Komisarjevsky are accused of killing the three women and setting their house on fire. Hayes is accused of sexually assaulting Jennifer and Komisarjevsky is accused of sexually assaulting Michaela.
Carver also provided disturbing testimony into analysis concerning the sexual assault of Michaela.
Before his testimony began, Dr. William Petit, the only survivor of the home invasion, left the courtroom on Thursday.
On Wednesday, Carver testified that Michaela died from breathing smoke after the suspects set fire to her home in Cheshire, and she likely had a painful, panic-stricken death.
Jon Farnham, a retired police officer, took the stand next and discussed text messages and photos found on Komisarjevsky’s phone.
Those photos included pictures of Michaela tied to her bed. Jurors, who have had to endure seeing graphic crime scene photos, were not made to look at the pictures on Komisarjevsky's cell phone.
They were however subjected to more disturbing testimony by associate medical examiner Dr. Susan Williams, the coroner who performed the autopsy on Jennifer Hawke-Petit.
Hawke-Petit was burned beyond recognition, Williams said. Williams had to used dental records to positively identify her.
Williams also testified that Hawke-Petit was strangled, and died before the fire was set.
Outside court Thursday, Jennifer Hawke-Petit's sister, Cynthia, said there were details of the girls' deaths the family "had not known, but now, no surprises," she said. "It's a sad day."
Jurors in the trial of Steven Hayes heard more difficult testimony Friday morning.
State forensic scientist Joy Reho testified about DNA evidence found on the remains of Jennifer Hawke-Petit and her daughters Hayley, 17 and Michaela, 11, who were killed during the home invasion of their Cheshire home in July 2007.
Reho told the jury the evidence confirmed that both Hawke-Petit and Michaela had been raped. She testified there was no evidence Hayley had been raped.
Prosecutors also entered the baseball bat used to beat Dr. William Petit into evidence Friday. Reho testified about blood found on the bat.