The man, whose name was not released, was found outside a home about 8 p.m., the Denver Post reported.
Police said they had not determined what led to the shooting, which occurred in the hours after the Broncos lost to Seattle 43-8 in the NFL championship game in New Jersey.
The newspaper said numerous pieces of Broncos' clothing were found on the ground where the man was shot.
Police said in a post on Twitter that they no suspects in custody.
Swim Week Miami Beach 2014 [PHOTOS]