well maybe they encounterd somthing that scared the living crp out ot them
like maybe the goverment was stopping them
encounter some mysterious figure that tells them to stop or X(
All the victims were involved with high-tech, defense-related research, most of it linked directly to the Strategic Defense Initiative (SDI), and all the deaths took place in the midst of a high-profile campaign by the Soviets to kill SDI development. Three of the dead men were senior advisors to Western European governments; each of them had participated in sensitive and previously secret SDI "cooperation talks' between their respective governments and Washington.