Meta-game wise, an individual by the name of David Felter (may be a mis-understood spelling of last name by any precise chance,) who is Pictojo outside of the RP, has full acknowledge to what may have happened to Alex Fieki. (again, a common misconception of the name by most, but understandable.)
Judging by the bare-witnessed and self-explanatory factors, Alex was indeed murdered by military personnel. He was shot 5 times, all individually in different places. He had at first tried to stop a military commando before being shot brutally by the same individual.
Alex's death was not to be blamed upon the colleagues that we all cooperated with. And Alex's fate was inevitable, and couldn't be resolved. This event has proven and clarified that the military operations here are intensifying, which may be leading the survivor's to be reaching a civil war with the military operations in this cordon.