CASA GRANDE, Ariz. (AP) -- A man is in custody for allegedly stabbing his mother's boyfriend in Casa Grande and then forcing his 6-year-old nephew to flee with him. Casa Grande police say 40-year-old Angelo Martinez is being held on suspicion of aggravated assault, kidnapping, child abuse and criminal damage. They say Martinez and his mother's boyfriend were involved in a confrontation earlier Sunday at a home in Casa Grande. He's accused of stabbing the man later and then taking his nephew with him as he fled into the nearby desert. The man was treated at a Phoenix-area hospital and released. His name hasn't been released. Police and Pinal County Sheriff's deputies found the nephew uninjured under a tree. Martinez was arrested late Sunday. Police didn't immediately know Monday if Martinez has legal representation yet.