New Mexico reserve nailed four free throws in the final :30 of overtime to seal the win.
The Utes could have avoided overtime but missed three tough shots in the final 13 seconds. Johnnie Bryant missed an off balanced runner, and two ensuing put back attempts also failed to fall for the Utes.
Bryant led the Utes with 19 points.
It actually looked bleak for the Utes early on. Thanks to nine UNM first half threes, the Lobos went up 40-15.
To make matters worse, center Luke Nevill played just 18 minutes after being saddled by foul trouble. He scored just nine points before fouling out.
The tough luck Utes did not wilt and clawed back into the game. A 10-2 run midway through the second half got the game within striking distance and a Curtis Eatmon three-point play tied the game at 73 with a minute left in regulation.
J.R. Giddens led all scorers with 26 points. He added 13 rebounds.
The Utes have now lost eight games this season by six points or less.
UTAH HEAD COACH RAY GIAGOLETTI
"We need to be able guard possessions without bailing (the other team) out with fouls and then be able to rebound balls. We had three or four (fouls) at the end. That's what wins or loses games. It's not about one guy going all out, it's about doing those things. One guy isn't going to beat you. If we could have done those things - played defense without fouling, bailing (them) out at the end of the stretches and then when they did miss, box-out.
"We had some guys step up. David Foster was unbelievable. He gave us a great lift. Curtis Eatmon, it could be the best he's played all year. I thought Ricky Johns did a real solid job overall. I'm proud of the effort. We dug ourselves a hole, dug ourselves out of it, had the ball at the end. Luke (Nevill) played 18 minutes. To survive with him sitting that many minutes is pretty impressive."