Murder by Mail by Bill Youngblood

A popular dentist is out jogging like he usually does when a black Mercedes pulls up and stops.  The driver calls him by name and then shoots him twice, leaving a newspaper article under his head...

I found this one on Book Review Buzz and the author kindly sent me a copy to read.  You can buy it now on Amazon.

As more deaths appear, it seems the common denominator is that they wrote letters to the editor.  They were a bit controversial but you wouldn't think someone would kill over it.

As the cops weed through the facts and try to determine who would be draining gas tanks and killing, it takes time before they make the connection.

This a well written story with no clue about who the killer is until the end.  I enjoyed the mystery and storyline.  Give it a try.  I bet you won't figure out the killer either.