A two-vehicle accident in Willmar on Thursday morning has left an Atwater man dead. Emergency responders believe 63 year old Michael Rieke may have had a medical emergency right before his minivan rear-ended a pickup driven by 87 year old Vernon Spieker of Willmar at the Willmar Avenue/South 1st Street intersection. Rieke was given first aid and transported to Carris Rice Hospital, where he was pronounced dead. Spieker was uninjured.