Transcript for New Details on Alleged Texas Gunman
Now to the latest on that horrific shooting in Texas that left six dead including four children. We are learning more about the suspected gunman and what may have been his motive. ABC's Ryan Owens is there for us in spring, Texas. Good morning, Ryan. Reporter: Good morning, robin. We are learning chilling new details about what happened inside of this home. And the young hero who made sure the bloodshed stopped right here. Authorities say six members of this family were executed simply because they wouldn't tell 33-year-old Ron Haskell where to find his ex-wife. Tragically unthinkable. I just -- I don't even know if I still believe it. It feels like a bad dream. Reporter: This morning Haskell who led police on a chase. White male by the name of Ron Haskell considered armed and dangerous. Reporter: Ending in a four-hour standoff is charged with capital murder and dressed as a FedEx deliveryman when he shot Steven and Katie stay. His ex Melanie is Katie stay's sister and has been living out of state since they divorced on Valentine's day. Ron could instill fear in her. It was a horrific relationship she was going through and she had had enough. Reporter: Haskell had been arrested for assaulting her before and until last year had a protective order against him. He had pulled her by her hair and struck her in the head. Reporter: His own mother got a restraining order against him just last week. Only one member of this family survived the rampage, 15-year-old Cassidy stay. Seen here with her mom in this Facebook photo. Haskell shot her too but she played dead until he left. Then called 911 to tell police he was headed to her maternal grandparents' house to kill them too. Officers got there first. Her paternal grandparents who live in southern California spoke with Cassidy Wednesday night. I said I was so sorry, Cassidy, about everything that's happened but I'm so grateful you're still with us and she said my mom and dad are in a better place. Reporter: Her paternal grandparents issued a statement calling her a hero and are in awe of her bravery. Cassidy was grazed we're told by a bullet in the head and remarkably, robin, she's expected do make a full recovery, the lone survivor. We wish her all the absolute best going forward.
This transcript has been automatically generated and may not be 100% accurate.