A young man accused in a series of San Diego-area gang-related killings and attempted slayings pleaded not guilty Monday to murder, attempted murder and conspiracy charges. Ismael Betancourt, 20, is charged in the Aug. 1, 2019, shooting death of 57-year-old Marco Magana in Mountain View, the Feb. 8 shooting death of 19- year-old Leah Posey […]