The 44-season NASCAR veteran and his wife, Cindy, were pit-stopping at a Vegas Walmart on Monday night, in search of an oil drain pan. Still in the parking lot, Shepherd saw several young men burst through the store doors, chased by security.
"I cuffed him and sat on top of him," Shepherd said in a press release on RaceWithFaith.com, the online home of his Faith Motorsports racing organization.
"The police department officers showed up and asked if I could hold him a while longer while they ran down the others. I told them he wasn't going anywhere."
Shepherd used his time with the teenager, later charged with petty larceny, to emphasize the poor choices the boy had made.
"I told him he shouldn't be stealing stuff," Shepherd said. "There is just too much of this stuff going on."
Racing since 1970, Shepherd has driven in 288 races, finished in the top ten 67 times, and won 15 times. His skill on four wheels extends to regular workouts roller skating and roller dancing.
Shepherd's success as a crime-fighter naturally springs not only from his love of speed but also from a lifelong devotion to doing good. Most recently, he donated the hoods of his team's race cars to the Salvation Army and committed to helping spread the word about the services the nonprofit provides.