Photographed in black and white film on May 1, 2020, at 104 King Fuk Street in Kowloon City.

Cheng Hoi Lam, a 40-year-old Chaozhou native, lived alone in Hong Kong but had a wife and children in his hometown. He worked as an ironing worker in a garment factory on the 7th floor of Wah Tai Factory Building, No. 104 King Fook Street, San Po Kong for many years. On the morning of May 1, 1970, Cheng and his colleague Chan Shui Hong quarrelled over work issues. The foreman feared that it would affect the work of other employees and ordered Chan to leave the factory. At 12:30 noon, Cheng left work and was attacked by Chan with a pair of scissors at the main entrance of the building. He was stabbed in the head and chest and fell to the ground with serious injuries. The murderer was subdued by passers-by immediately, but the injured died on the way to the hospital.

2020年5月1日以黑白菲林攝於新蒲崗景福街104號。

潮州人鄭海藍，40歲，獨居香港，但有妻兒在鄉下。他在新蒲崗景福街104號華大工業大廈7樓永嘉製衣廠任熨衣工人多年。1970年5月1日上午，鄭跟同事陳瑞漢因工作問題發生衝突而吵鬧起來，管工恐怕影響其他員工工作， 著令陳離開工廠。中午十二時半，鄭下班離開，就在大廈正門遭陳以利剪襲擊，刺傷頭和胸部，重傷倒地，兇手即時被途人制服，傷者卻在送院途中不治。