Fifteen-year-old Alejandro Vargas Martinez, a Boone High School student from Orlando, Florida, was shot and killed on December 18, 2018 while walking to school and talking to his mother on his cellphone.

The investigation stretched over several years. A cold case unit reopened long-open homicides and authorities later linked Florence to a string of robberies, commercial burglaries, and car thefts in Orange and Seminole counties in late 2018 and early 2019. Denim Williams was shot and killed during a separate robbery attempt a few weeks after Alejandro’s death; Florence was convicted earlier in that incident of second-degree murder and had recently been released from prison before being arrested in Alejandro’s case. Florence was arrested on charges including first-degree murder, robbery by snatching, racketeering, and related crimes, and was being held without bail in the Orange County jail awaiting trial.

Alejandro’s family described him as a beloved son, sibling, and student. What information can anyone who knew Alejandro or who was in the area that morning share about what happened?