1. When game is the cause of death

 ANDRES ESCOBAR

Date: June 22, 1994
Match: USA vs. Colombia, World Cup group stage

It was an honest mistake. Desperate to intercept an American cross, Andres Escobar, a Colombian center half, slid in at full stretch. Instead of just intercepting it though, he put the ball past his own keeper and into his own net. It was the first of the USA's two goals as they went on to win 2-1 and Colombia were knocked out of the World Cup. 

That should have been that. Escobar was devastated and decided to fly back to Colombia. At 3 a.m. on the July 2, ten days after the own goal, Andres Escobar was murdered in the car park of a nightclub in his hometown of Medellin. News reports have said that the murder was a punishment by local gangsters for the own goal, with some reports even saying that the murderer shouted "own goal" as he pulled the trigger.