据调查者称：凶手向被害人注射肌肉松弛剂，使之窒息致死，然后销毁任何争斗的痕迹，重新关上房门并离开了房间。
They injected him with a muscle relaxant, suffocated him and then smoothed away any signs of struggle, reattaching the hotel door chain as they left the room, investigators say.
研究的步骤主要为收集现场信息、现场分析、调查被害人的相关信息、划定犯罪嫌疑人范围。
The research main step to collect the scene information, the scene analysis, to investigate victim's related information, to delimit the suspect scope.
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