Zimmerman spent his formative years living in Las Vegas, from ages 10 to 20. He went to bed that night, like so many did, not expecting the historic tragedy that unfolded later when a gunman killed 58 people from windows in a 32nd floor suite at Mandalay Bay and injured more than 500 others during a music festival.
The game will be a homecoming for Zimmerman, whose family will be there, but he'll make this trip with a heavier heart after what his hometown has been through.
Zimmerman was lucky. Although he had some friends who did attend the concert, they were safe.