Some can make obvious conclusions
- he moved multiple times
- led obscure life - no socializing 
- was a pilot - owned 2 planes
- had tons of money which was spent on Las Vega
- automatic weapons found in room - was dead by the time police found him
 This is the script I would write:
Probably ran drugs for drug cartel, laundered money in Las Vegas.  Probably did not do the shooting - done by drug cartel, who shot him in the end -  he was framed.