Two men were each jailed for four years yesterday after admitting they attacked and killed an intoxicated billionaire outside a Mong Kok flat where massage services were once provided. Petrochemical company owner Tang Kin-keung, 36, died on February 13 after being attacked in a building in Shanghai Street at about 5.15am on February 8. Andy Dong Shing-hing, 38, and Chan Ping-keung, 47, each pleaded guilty to one charge of manslaughter before Madam Justice Clare-Marie Beeson in the Court of First Instance yesterday. Senior government counsel Anthea Pang Po-kam told the court Tang had been to dinner at the InterContinental and a Tsim Sha Tsui karaoke bar with friends on February 7. He went home to Tai Po, but was later driven to somewhere near Shanghai Street at about 3.30am on February 8. The court heard that Tang appeared to be drunk when he arrived in Shanghai Street and stayed in a nightclub until 4.45am. He then went to the building at No 714 Shanghai Street and knocked on the door of a flat on the first floor. Ms Pang said the flat used to provide massage services but had been occupied by Dong and Chan since the business closed. Ms Pang said Dong first fought with Tang, who had been making a lot of noise outside the flat, and then Chan joined the fight. During the scuffle, Tang lost his balance and fell down a 15-step staircase to the ground outside the building. He was left lying there until a police officer found him at about 5.20am. Tang was taken to hospital in critical condition and was certified dead on February 13.