A driver was arrested for manslaughter after a security guard was found dead in a Sha Tin carpark early Sunday. A 69-year-old security guard, surnamed Yuen, was found lying in the Jat Min Chuen carpark at 12.39 am. Officers said Yuen was seen arguing with a private car driver over the parking toll and had a physical altercation. It is learned that the enraged driver once punched Yuen in his face, and Yuen was later found lying unconscious in the booth. The police searched the involved sedan, which was still at the site of the incident, and seized two grams of cannabis.