Crime / Colorado After Girl, 10, Found Dead, 15-Year-Old Boy Arrested She was last seen with son of father's girlfriend By Newser Editors and Wire Services Posted Jun 12, 2017 2:43 AM CDT Copied Police officers keep guard over the scene where the body of a young girl was found, Thursday, June 8, 2017 in Thornton, Colo. (Helen H. Richardson/The Denver Post via AP) A 15-year-old boy has been arrested on suspicion of first-degree murder in the death of a 10-year-old Colorado girl. Kiaya Campbell was reported missing in the city of Thornton on Wednesday, and her body was found the next day about 1.5 miles from her father's house, the AP reports. Investigators said her body had signs of severe trauma. Kiaya was last seen with the 15-year-old son of her father's girlfriend. Police wouldn't confirm if he was the boy arrested Saturday night. The girlfriend's son had told investigators that he and the girl had gotten separated during a thunderstorm, though some neighbors disputed that there was a storm that night, reports the Denver Post. (More Colorado stories.) Report an error