The team put in a request in the past day, and the NFL approved it Friday afternoon, league spokesman Greg Aiello told Rapoport.
Cowboys defensive tackle Josh Brent -- Brown's close friend and the driver that night -- has been charged with intoxication manslaughter in connection with the accident.
Brent has been moved to the reserve/non-football injury list, ending his season. It was reported Thursday that Brent had a blood alcohol level more than twice the legal limit on the night of the crash.
Follow Dan Hanzus on Twitter @DanHanzus.