The State Occupational Safety and Health Division is investigating the death of Viking offensive lineman Korey Stringer. Officials plan to talk with the Vikings about the training team staffers recieve regarding heat-related illnesses. Stringer died yesterday of complications from heat stroke, after collapsing following a practice where the heat index reached 110 degrees. The National Football League is also recommending all 31 teams review their rules on training conditions. Ed Garvey is former executive director of the NFL player's association. He thinks the NFL has a responsibility to institute uniform regulations.