Washington Redskins safety Montae Nicholson is back at practice ... this while an investigation into a 21-year-old woman's death continues.
Nicholson was one of two men who brought an unconscious and unresponsive woman to an E.R. in Ashburn, Virginia on Thursday at around 1:30 AM. Officials say the woman died at the hospital and all signs point to a drug overdose.
Nicholson has NOT been arrested or accused of any wrongdoing -- but officials are VERY curious about what happened before she arrived at the hospital. We're told Nicholson is cooperating with authorities as the investigation continues.