A student at Minuteman High School in Lexington has died after this motorcycle crash in Belmont earlier in the week. And now - police are asking for any witnesses to come forward. They say a vehicle collided with the green motorcycle on Winter Street Monday, around 4p-m. The victim 16-year-old Andrea Martocchia, from Watertown - who was on the bike - died yesterday at the hospital. He was in the 11th grade. Police are still trying to piece together what led up to the crash.