Source of pills taken by Okla. linebacker unknown

El Reno police say they're still trying to
determine where a University of Oklahoma linebacker who died after
ingesting prescription medication got the pills.
Police Chief Ken Brown says investigators have determined that
the medication found in Box's system hadn't been prescribed. Brown
didn't immediately return a call seeking comment Wednesday.
A friend found Austin Box unresponsive in the friend's El Reno
home and called authorities May 19. The friend told a dispatcher
Box wasn't breathing, that Box had been taking pain pills, and
later told a police officer "he believed he had overdosed."
A state Medical Examiner's autopsy found the painkillers
oxymorphone, morphine, hydrocodone, hydromorphone and oxycodone in
Box's system, along with the anti-anxiety drug alprazolam.
Box had an enlarged heart and a chronic pain history.