UPPER ST. CLAIR, Pa. (KDKA) — The father of a 3-month-old child who was left in a hot car is now facing charges.A warrant has been issued for the arrest of Khang Nguyen in connection with the death of his son, Kayden Nguyen, in Upper St. Clair in June. The warrant and the charges have not been made public, but KDKA-TV has confirmed the warrant.On a hot day in June, police and paramedics found the lifeless body of Kayden Nguyen in a child seat in the back of his father's minivan. His father told police that he had gone to work...