Athing Mu, reigning 800-meter gold medalist, will miss Paris Olympics after falling during U.S. trials

Olympic gold medalist Athing Mu will miss the Paris Olympics after she fell during the women's 800-meter final at U.S. trials in Eugene, Oregon, on Monday. 

Mu, who won a gold medal at the Tokyo Olympics, won't defend her title after she finished last in the final. The NBC Sports broadcast showed Mu appearing to trip about 200 meters into the race after getting tangled up with other runners. 

Mu tried to get back in mix, but the lead became too insurmountable.