A Texas father caught a man sexually assaulting his 4-year-old daughter and punched him in the head repeatedly, killing him, authorities said. The father was casually acquainted with the alleged abuser, said Lavaca County Sheriff Micah Harmon. Neither has been publicly identified. The girl was left inside the family's house during the social gathering, while other members of her family were tending to horses, the sheriff said. The alleged abuser was known for his horse-grooming abilities, Harmon said.