A 15-year-old boy fatally shot himself in his head while video chatting with a friend in what police initially suspected was a tragic accident — but the coroner has ruled suicide.  Blake Hannett was found slumped over in a chair at a desk in his Illinois home around 8 p.m. Thursday with a .38-caliber handgun on the floor beneath him, Lynwood police said.  The Marian Catholic High School sophomore had been talking with a friend on the video program FaceTime only moments before the gun fired, leaving the friend with a blank screen, that individual told police.  Exactly how much the friend may have seen of Hannett's death, if anything at all, was not released by police who declined further comment when reached by the Daily News Friday.  Hannett's family told WLS that the teen was home alone and out of fear armed himself with the handgun when he thought he heard an intruder. It went off when he placed it down in his bedroom, they said.  The Cook County Medical Examiner's office ruled his death a suicide Friday, saying he died from a gunshot wound to his head, an official told The News.  There was no sign of forced entry into the home, police said after searching the home when called over a report of gun fire.  They offered their prayer and condolences to the grieving family in a statement, as Hannett's Chicago Heights high school mutually mourned the young student's sudden loss.  "His friendly outgoing personality and sense of humor helped to promote a team spirit both in the classroom and in the band," a statement released by the school Friday read in part.  "His million dollar smile and joyful spirit will be missed in the hallways of Marian Catholic but never forgotten. We are deeply saddened by his death."  Police said their investigation is ongoing.
Blake Hannett's cause of death has been ruled a suicide by a medical examiner, but his Lynwood family have said that it was an accident.