We now know more about the twin falls man accused of severe child abuse in the death of a three year old boy. According to court documents 19 year old Lane Buddenhagen told investigators the child may have fallen out of a bathtub. But a doctor who treated the child didn't believe that story. The court records give some explanation about what happened on Saturday, when the 3-year-old died. Around 7:30 in the morning, Buddenhagen called police to his apartment. When officers arrived they found him alone in the apartment with the child laying on the floor of a bedroom. Buddenhagen told them he stepped away from the child's bath for a moment when he heard a loud sound. He returned to the bathroom and found the 3-year-old unresponsive. A doctor who treated the child at St. Luke's in Twin Falls told detectives he didn't believe the child's injuries were consistent with falling on a bathroom floor, he saw bruises that appeared to be hand marks on the child's arms. He also said a CT scan of the child's head appeared to reveal a large amount of internal damage. KTVB TV spoke with the 3 year old's mother. She says Buddenhagen is her fiancee and she doesn't believe he is responsible for her son's death. She says her little boy adored the 19 year old man.  Buddenhagen is in jail charged with one count felony injury to a child. He is due back in court for a preliminary hearing on August 19th.