Kota Kinabalu acting police chief Supt George Abd Rakman said today that Wong Vee Au, 35, died on the spot in the 2.30pm incident.
He said some workers doing renovation work on the floor heard his screams as he plunged down and found him lying sprawled on the 3rd floor of the block.
He added that Wong was working alone on the 14th floor when the mishap happened.
His body was sent to the Queen Elizabeth 1 Hospital here and police have classified the case as sudden death.