A 46-year-old contract worker died and another person was injured in a reported wall collapse at HPCL Visakh refinery here on Friday. According to the HPCL officials, the incident occurred at the project site at about 12:45 p.m. due to the collapse of the retaining wall on two contract workers who were carrying out civil works at the area. After providing first-aid at the HPCL OHC (Dispensary), the injured persons were taken to a hospital for treatment. One of the workers, K. Krishna, died while undergoing treatment. The other contract worker is undergoing treatment. The city police are investigating the incident.