Larry Parks was 17 when he was shot and killed while walking on the 300 block of New Castle Avenue in Wilmington on the afternoon of January 21, 2012. Officers arriving about 3:54 p.m. found him in the street with a gunshot wound to the chest; paramedics took him to Christiana Hospital, where he was pronounced dead. Parks lived in Bear and was a tenth-grade student at Pencader Charter High School, where counselors and classmates gathered to grieve.

Family members and investigators said the violence followed an argument that spilled from social media into real life. Parks’ father described a back-and-forth on Facebook that never felt like a real threat until it was too late. Within days a 17-year-old, Deshawn Dorsett, turned himself in and was charged with first-degree murder and weapons offenses; the next summer Dashawn Dorsett pleaded guilty to second-degree murder.

Did anyone who knew Larry or who was in that neighborhood that afternoon see anything that might explain how an online dispute turned deadly?