EMPLOYEE MENTIONED THAT HE FELT DIZZY & LIGHTHEADED & A CO-WORKER TOLD HIM TO SIT DOWN IN THE STORAGE DUMPSTER. EE WENT TO THE BREAK ROOM WHERE IT WAS WARMER, AT THIS TIME EE WAS CONSCIOUS & TALKING. AT APPROX. 9 AM CO-WORKER SAW EE HAVING A SEIZURE, HIS FACE WAS RED & HE APPEARED TO NOT BE BREATING. MASSIVE HEART ATTACK.