Fort Worth police have a 30-year-old man locked up on charges he killed his two-year-old step-daughter. The toddler was brought to the hospital last month and doctors immediately knew her severe head injuries were no accident. Samson Matthew Loynachan was picked up on a capital murder warrant on Friday. CPS and detectives spoke with Loynachin and his live-in girl-friend, the mother of the little girl. They say neither of them could give any plausible explanation for how the child was injured. Both have other children, but they live with their other parents, so CPS is not intervening in those cases.