Denver Broncos star Von Miller -- the MVP of Super Bowl 50 -- is under criminal investigation in Colorado ... according to multiple reports.
Details of the allegations against the future Hall of Famer are unclear ... a spokesperson for the Parker Police Dept. in Parker, Colo. told 9News on Friday, "We’re not commenting on nature of the allegations."
"We haven't completed the investigation," the spokesperson added.
Miller -- who sat out this season after suffering a tendon injury in his lower leg in September -- is still considered one of the most feared defenders in the NFL.