One of two men convicted of killing a Burlington High School student almost two years ago was sentenced Monday to life in prison without parole.Jorge “Lumni” Sanders-Galvez, 23, of St. Louis, was given the mandatory life sentence in the killing of Kedarie Johnson, a 16-year-old gender-fluid youth whose body was found in March 2016 in an alley behind a home near Fourth and Walnut streets on South Hill.Investigators said Johnson bled to death after being shot twice in the chest with a .357 revolver.