on the most recent kill, the unsub killed

寄生虫判断不明嫌犯
as recently as a month ago,

在一个月前动过手
Which means he's still active.

说明他还在作案
How did you establish a timeline so quickly?

你怎么这么快就能建立时间表
By reverse engineering mother nature.

将大自然的规律倒回去看
Each year, sand and sediment cover up the remains,

每年沙子与沉积物覆盖住遗骸
creating layers on the ocean floor.

这样就在海底形成一个平面
That makes sense. The deeper the pump dug, the older the remains.

有道理水泵挖得越深遗骸就越早
9 victims in 9 years means that he's in control of his urges.

九年九个被害人表明他能控制自己的冲动
Any sense of the victimology?

被害者研究有何说法
Only that he likes variety.

只能看出他选择各种被害人
Pelvic bone width indicates that he kills both men and woman,

从骨盆宽度判断他杀男人也杀女人