Detroit, MI) -- Three men died Sunday while running the Detroit Marathon. Race officials say the three likely died of cardiac arrest during the race. Two collapsed at the finish line while the third went down at the 12-mile mark while at a fluid station. While deaths during marathons are rare, four have now passed away in recent weeks. Before the three in Detroit, a 23-year-old man died while running a marathon in Baltimore on October 10. Studies show about one in every 100-thousand runners die during marathons, with roughly half of those deaths happening in the last mile.