Wu was awoken by them and confronted them. Angered, they tied the couple up, ransacked the home for valuables, and raped the woman. The four (Wang Wen-chung kept lookout outside, according to the charges) then brutally stabbed the couple 79 times. The number of wounds inflicted made police and prosecutors suspect more than one person was involved.
遭到吳銘漢斥責後，4 人憤而制住兩夫婦，除繼續搜獵財物外，更起意輪姦葉女，4 人（除在屋外把風的王文忠外）更猛刺被害者 79 刀致死，刀數過多，遂讓警檢推論犯案者不只一人。