Washington Redskins safety Montae Nicholson is cooperating with authorities who are investigating the death of a 21-year-old woman, TMZ Sports has learned.
Here's what we know ... law enforcement has confirmed a "death investigation" is underway after an unconscious and unresponsive woman was brought to an E.R. in Ashburn, Virginia on Thursday around 1:30 AM.
The victim was pronounced dead in the emergency room. We're told officials believe the woman died from a drug overdose.
Cops tell us ... "The two males who brought her to the emergency room immediately left the area but have since been identified and located.