From a New York Times obit by Clay Risen headlined “Jim Redmond, Whose Aid to Son Was an Olympic Moment, Dies at 81”:

Jim Redmond, who created one of the most memorable moments in Olympic history during a 400-meter men’s race at the 1992 Games when he leaped onto the track to help his injured son, Derek, make his way across the finish line, died in Northampton, Britain.

A champion sprinter from England, Derek Redmond was widely favored to win a medal at the 1992 Games in Barcelona.