I know this sounds crazy,

这可能有点难以置信
but I think our unsub is obsessed with the praying mantis.

但我觉得此嫌犯对螳螂非常痴迷
That also explains why he poses the victims' hands like this

这也解释了他为何让死者的指尖朝下
instead of like this.

而不是朝上
The praying mantis can kill any of a multitude of creatures,

螳螂能杀死许多生物
but the most interesting fact is that oftentimes the female mantis

但有个最有趣的现象即雌性螳螂
engages in sexual cannibalism,

经常会性食同类
meaning she'll bite off the head of her mate

就是说她在交配完成后
once copulation is complete,

会立刻咬下配偶的头部
sometimes even during intercourse, actually.

有时甚至在交配过程中就会行动
So that's what someone did to our unsub.

就是说有人这样对待过嫌犯
It also explains why he shoots his victims through the heart.

所以他开枪都是直射被害人的心脏