Officials said Daniel Langdon , 36 , of Laingsburg , Mich . , collapsed at about 9 : 02 a.m. , between the 11- and 12-mile markers ; Rick Brown , 65 , of Marietta , Ohio , collapsed at 9 : 17 a.m. , not far from where Langdon fell ; Jon Fenlon , 26 , of Waterford , Mich . , collapsed at about 9 : 18 a.m. , just after finishing the half-marathon .