Autopsy reveals no brain trauma in Plano teen who killed mother, brother
![Plano murder suicide investigation](https://images.foxtv.com/static.fox4news.com/www.fox4news.com/content/uploads/2019/08/764/432/009461bc-plano20murder_1460157614830_1166067_ver1.0_640_360.jpg?ve=1&tl=1)
An autopsy found no evidence of traumatic brain injuries or abnormalities in the brain of a young Plano man who stabbed his mother and brother to death before killing himself.
An additional toxicology report also didn't detect any synthetic drugs in 19-year-old McCann Utu's system.
Plano police found TV food personality Stacy Fawcett and her 17-year-old son Josiah Utu stabbed to death in their home in April.
McCann was found with self-inflicted stab wounds. He died from his injuries at the hospital.
Police ruled the deaths a double murder-suicide.
Family members believed McCann was never the same after suffering two head injuries several years ago.