NASHVILLE—An illegal immigrant admitted to killing a Nashville business owner in a hit-and-run, a detective testified on Tuesday. Nashville Police Homicide Detective Tyler Manivong testified during a preliminary hearing that 29-year-old Ulises Martinez, an illegal immigrant from Mexico, admitted to police last month that he was driving the truck that on June 19 struck 42-year-old Matt Carney in the parking lot of Smokin Thighs, Carney’s popular…