I've come all the way back to thinking this was a "hit". Even though DM was shot once, through his car window. Not a "pro hitman", maybe, but he killed DM and got clear away. In this scenario, LE has likely pieced together a viable motive ( people close to DM may have given LE some reasons for his murder), but without any proof, no one talking,and no shooter ...it may never be solved. This case kind of reminds me of the murder of Alistair Wilson in Scotland... all jmo.
First i have heard of the AW murder, thanks for posting- some interesting parallels with this case.
http://www.websleuths.com/forums/sh...256469&highlight=Alistair+Wilson#post12256469
UK - Alistair Wilson, 30, Nairn, Scotland, 28 November 2004