As the soft-spoken, highly intelligent son of missionaries in Morganton, North Carolina, Luke Chang gave no indication of the killer he would become. But after hacking into a teacher's computer at his school, a stint in the Marines was his only option. As a young recruit, Luke was taunted for being a virgin who didn't cuss, drink, or smoke pot. That all changed when Luke met Casey Byrams, a fun-loving musician and fellow Marine from Cullman,...