Given that virtually every single fragment of the rocket is going to be recovered and examined, most especially in the area where the explosion originated. Evidence of a bullet strike is going to be very very obvious.
The sniper gets caught (the aforementioned money troubles would be a good start in pinning him or her down) and would be offered the choice of ten years or sixty years in jail. The sniper would immediately sing the names of "the people with a motive". A good reason why the paid-sniper scenario is unlikely.