Chicago Marathon

The Associated Press reports that an autopsy showed a heart condition, not record-setting heat, killed a Michigan police officer who died during an unusually hot and humid Chicago Marathon on Sunday. Chad Schieber, who collapsed while running on the city's South Side, had a mitral valve prolapse and did not die from the heat, the medical examiner's office said Monday. Several other people collapsed, and at least two remained in critical condition Monday, as record heat and smothering humidity forced race organizers to shut down the course midway through the event