A young Florida couple was planning a wedding and their life together when the future groom was shot and killed at his front door. Patrick De La Cerda was expecting a delivery of the engagement ring for his fiancée, Jessica Devnani. Instead, say investigators, when he went to the door on Feb. 27, 2018, he was met with a hail of bullets. Peter Van Sant and 48 HOURS report on the shooting and the unexpected twists in the investigation in "The Ring: The Murder of Patrick De La Cerda."