According to area news reports, Luna and Romero were riding in a late model Mazda B2500 pickup truck and waiting to cross the border into the U.S. when they were gunned down by an unknown assailant who shot them with a 9mm caliber gun.
The 25-year-old Luna and 28-year-old Romero both worked for West Coast Beverage Maintenance, a San Diego company. Both men were reportedly American citizens who lived in Mexico to save money and drove into the U.S. to work. Company owner Matt Pelot told The San Diego Union Tribune that both men had worked for him for about 18 months and were frequently asking for overtime to earn extra money.
Baja California attorney general Rommel Moreno Manjarrez told reporters that detectives were investigating the possibility that the incident could be drug related, saying one of the victims had "a small packet" of drugs among his belongings.
U.S. law enforcement, though, told the San Diego paper that neither man had a criminal record. Pelot, meanwhile, added that both men were clean cut and would often cross the border early and then take a nap before beginning their shifts.
A welterweight, Luna was 4-5 in his pro career, fighting his most notable battles against former WEC fighter Poppies Martinez and recent Ultimate Fighter alumni Sako Chivitchian. According to the Union-Tribune, he had been training to fight again in June when a gunman cut his life short.