Police are turning to Facebook for evidence related to a deadly West Valley City shooting earlier this year. A Magna teenager allegedly shot and killed Marcos Cardenas, 22, at a bus stop on June 10 after investigators say the two argued about gang ties. The teen, who was 15 at the time of the incident, has since been charged in 3rd District Juvenile Court with first-degree felony murder and three counts of felony discharge of a firearm, a second-degree felony. A West Valley City police officer f...