California is investigating six possible heat-related deaths, including two cases of farmworkers who collapsed while harvesting crops, officials said Thursday, July 23.The state Division of Occupational Safety and Health, also known as Cal/OSHA, is reviewing whether a 47-year-old worker in Blythe (Riverside County) died because he was operating a tractor to harvest cantaloupes in 102-degree heat on July 7, spokeswoman Erika Monterroza said. The agency is also investigating the April death of a 56-year-old farmworker who was breaking corn in 84-degree heat in Imperial County.