Authorities say digital material helped connect 15-year-old Harvey Willgoose’s murder to a classmate turned alleged attacker, Umar Khan. According to reporting, Khan attended the school with a hunting knife concealed under his coat and later killed Willgoose. Coverage also states that Snapchat posts and messages were part of the investigative picture, including threats and imagery described as involving knives. The reports describe how online activity, paired with other available information, provided leads used to identify and pursue Khan in relation to the killing. The accounts focus on how messages and pictures shared on social media formed “digital clues” during the investigation, linking the alleged motive and the circumstances surrounding the attack. Both articles use similar descriptions of the timeline around lunchtime at school and the role of Snapchat in the case, though they do not provide the full legal outcome in the provided text. The reporting characterizes the evidence as contributory to investigators’ identification and case-building around the incident.