Thin lips III

The  following AP article appeared on Yahoos News this morning: 

http://news.yahoo.com/more-human-remains-found-calif-ranch-054606430.html

It is about two men, Wesley Shermantine and Loren Herzog, known as the "Speed Freak Killers," who are thought to have killed as many as 15 people -- by some accounts more -- and dumped them in a well on an abandoned farm once owned by Shermantine's family. 

Shermantine is on Death Row, but Herzog's conviction was overturned when a judge found his confession to have been illegally obtained. However, he committed suicide a month ago when he found out that Shermantine was telling authorities about the well and two other locations. 

I'd never heard of these two before, so was curious as to what they looked like. Here's Shermantine: 

And here's Loren Herzog: 

Both men have the thin lips that seem to be so typical of Caucasian serial killers. I can't begin to explain it, or even come up with a theory as to why this might be. But it's hard not to notice the correlation.