The man was seen, running and on fire, by a security guard for M&T Bank Stadium around 3 p.m., according to Blair Skinner, a spokeswoman for the Baltimore Fire Department, said Sunday. By the time medics arrived, the man was dead and three portable toilets were on fire. It wasn’t clear how long he had been in the toilet or what had caused the fire. Skinner said arson teams with the Baltimore Police Department would be investigating.