Jiang Yuan took Sun Jianyu's profile in hand, meticulously reviewed it multiple times, and then had his hand and foot prints reproduced for comparison against the strangulation marks on the deceased's body.
Sun Jianyu was less than 170 cm tall and weighed just over 40 kg, with a slim waist, thin legs, and narrow arms—a pure skinny figure. The victim, Sun Xiuwen, weighed about the same as Sun Jianyu. Despite being female and slightly weaker in terms of physical strength, it would be relatively difficult for Sun Jianyu to smother her to death on his own.
It wasn't surprising that there were strangulation marks on Sun Xiuwen's neck; presumably, Sun Jianyu or Liu Mingxue had assisted in the act. However, the victim's hyoid bone was not fractured, which also indicated insufficient force in the strangulation.
