The Tarrant County medical examiner says a girl who was sexually assaulted and murdered in July died after being smothered by plastic bags.
According to police documents, investigators believe Tyler Holder acted alone.
They believe he used his mother's car on the day 6-year-old Alanna Gallagher of Saginaw was killed.
Police also took what's believed to be Alanna's watch from Holder's home.
He is charged with capital murder and also attempted murder for shooting an Arlington police officer.
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