COLUMBUS, Neb.—A young man has been found guilty of first-degree murder in the 2020 shooting death of a Lincoln police investigator who was among officers serving an arrest warrant in a homicide case. A jury returned guilty verdicts Monday on the murder count as well as assault, escape and several weapons counts against 19-year-old Felipe Vazquez, the Lincoln Journal Star reported. He faces a mandatory prison term of life, plus 194 years, when he’s sentenced May 25 for the death of investigator Luis “Mario” Herrera. Herrera was a 23-year-veteran of the Lincoln police department and was among several officers who went to Vazquez’s home on Aug. 26, 2020, to serve an arrest warrant for the then-17-year-old Vazquez in the stabbing death of 36-year-old Edward Varejcka months earlier. Prosecutors said Vazquez shot at officers as he and another man tried to escape the home. Herrera was wearing plain clothes and was …