Thompson Kao Kang and Shan Mao untimely deaths

Hi! I would know, if possible, some detail about stuntmen-actors Thompson Kao Kang and Taiwanese character Shan Mao: the former made 30 movies before he was murdered by a policeman in a street-quarrel, Hong Kong 4 august 1980. I've read his killing caused a strong reaction among local cinematic community. Does anyone know anything more about this? By the way Ko Kung made also a (terrible!) movie near my home in Rome: Kung Fu brothers in the wild west, filmed in the countryside of Rome in a western village I saw each time I went out with my parents. About Shan Mao he was a regular henchman in Wang Yu's or Bruce Li's movies and he also died untimely, murdered by a taxidriver armed with a screwdriver 14 February 1977, do you know something more about him? I've read he and his on-screen partner and real-life friend actor Lung Fei were associated with some Triad. Lung Fei is another old school movies' guy I would know better. I've read their filmography here and I'm grateful if HKMDB or his users can add any sort of details about their lives or deaths. Thanks so much and Happy New Year.