They had been practicing in full pads and helmets , as the heat index reached 110 degrees .
There were the Minnesota Vikings on a brutally scorching August day in 2001 , gathering in a panic around lineman Korey Stringer as he fell unconscious and later died of heatstroke .
Minnesota Vikings had been practicing in full pads and helmets , as the heat index reached 110 degrees .
There were the Minnesota Vikings on a brutally scorching August day in 2001 , gathering in a panic around lineman Korey Stringer as he fell unconscious and later died of heatstroke .