Olympic sprinter shot dead during nightclub brawl in Bahamas

Hart was shot in the chest while trying to break up a fight in the parking lot

Olympic champion Peres Jepchirchir out of World Championships

Francine Niyonsaba and Olympic 400m champion Steven Gardiner have also scratched from Eugene this week

Karsten Warholm to run a straight 400m at Lausanne

A trio of Canadian men will be competing at the Lausanne Diamond League on Thursday