"What are the odds of that?"
Someone has been watching too many James Bond movies. This is a situation where one should consider Occam's razor.
It would take a considerable amount of effort to intentionally set up such a situation. Aside from getting the other vehicle to carry out such a maneuver with the requisite timing and precision to hit another vehicle that presumably carries out some evasive actions and do so with sufficient speed to ensure fatal damage, there is also the problem of locating and identifying the specific target in time. I doubt you would find a sufficiently skilled and motivated volunteer. The alternative scenario involving remote control or some kind of homing guidance would involve considerable engineering effort - note that there would be a need for sensors and other bits and pieces that would likely be noticed in the aftermath, and would likely provide some clues to the identity of the responsible party.