KANSAS CITY, Mo.—A former suburban Kansas City police chief who helped rescue a baby from an icy pond and later assaulted the man accused of trying to kill the infant has pleaded guilty in the case. Greg Hallgrimson, 51, pleaded guilty in federal court Wednesday, the Kansas City Star reported. He was indicted in 2019 on a single count of violating the civil rights of Jonathon Zicarelli. Prosecutors have said Hallgrimson threw a handcuffed Zicarelli to the ground, punched him in the face and told Zicarelli, “You deserve to die,” after returning from the rescue mission to the Greenwood, Missouri, police station. Zicarelli had walked into the police station in December 2018 and said he had tried to drown his 6-month-old daughter in a nearby pond, police said. Hallgrimson and another officer rushed to the pond and found the unconscious infant floating face up and her lungs filled with water. …