"Our team and our entire organization are deeply saddened by the news of Michael's loss," Cowboys owner Jerry Jones said in a statement. "His family is our family. We share in the grief and pain that comes with something so personal and tragic. We offer our support, care and comfort for Michael, and we ask that all of those who have sons and daughters and brothers and sisters join us in keeping Michael and his wonderful family in their thoughts and prayers."
Sunday's game in Atlanta was something of a homecoming for Gallup, who was born and raised in Georgia. His only catch was a 10-yarder for a third-down conversion early in the winning drive. Brett Maher kicked a field goal as time expired.
The Associated Press contributed to this report.