Mark Shenefeld, known to Dallas Cowboys fans as “Tattoo Mark,” passed away on October 13, 2026. A heart attack took him at the age of 64 – and for those who had ever seen him in the AT&T Stadium parking lot, it sounded like a blow. Not just a man died, but one of the brightest symbols of American football fan culture disappeared, the very one whose body was a living poster for the team.