A 74-year-old woman died yesterday and three other elderly women were injured when a parked truck rolled backwards onto a footpath. Wong Yee-hing was declared dead in hospital about an hour after the truck struck a group of elderly people queuing for a talk on health food at a shop in Western. The driver, So Ying-chi, 69, had parked on a slope in Third Street near the junction of Eastern Street before the accident happened at 9.30am, police said. A police spokesman said the truck hit a wall outside the shop before stopping. Police are investigating how far it rolled and whether the handbrake was on. The injured four were among a group of about 10 outside the shop. Wong and Kwok Yuen-man, 72, were hit by the truck, while Lee Yuk-fung, 90, and Yuen Tai-tai, 74, were knocked down by fleeing pedestrians. The four were taken to Queen Mary Hospital, where doctors declared Wong dead at 10.25am. The other three were discharged. 'It appeared that [Wong] was badly hit in the back by the working platform on the rear of the truck,' senior station officer Chang Wai-kai of Kennedy Town Fire Station said. 'She was unconscious lying face down on the pavement when we arrived.' The driver passed a breathalyser test with a zero-alcohol reading. No one has been arrested.