A fellow runner told authorities she was running near mile 12 when she heard someone hit the ground. He was later identified as RIck Brown.
According to a Detroit newspaper, Daniel Langdon, 36, of Laingsburg, Mich., collapsed at about 9 a.m. between the 11 and 12-mile markers; Rick Brown, 65, of Marietta, Ohio, collapsed at 9:17 a.m., near where Mr. Langdon went down, and 26-year-old Jon Fenlon of Waterford, Mich., collapsed at 9:18 a.m., just after finishing the half-marathon in 1:53:37.
All of the men were pronounced dead at the hospital. Officials said they are trying to piece together what happened.
The temperature was about 28 degrees when the marathon started and had risen to 41 degrees by 10 a.m. It is not believed that the temperature had anything to do with the men's deaths.