Watch the water.
The deaths, which have occurred since at least 1997, share a lot in common; namely, the victims have similar profiles. They are young, athletic, handsome men, typically in their 20s and typically Caucasian, who vanish after nights out in bars with friends, only to turn up deceased in rivers or lakes, in some cases under more suspicious circumstances than in others.
https://heavy.com/entertainment/2019/01/smiley-face-killers-killer-serial/