Investigators aren't sure exactly when 82-year-old Isaak Komisarchik died—but they know he died alone, trapped in an elevator, after calling for help and getting no response. 

The Denver man, who had dementia, was found dead in an elevator at an apartment complex on Aug. 2 after residents reported a terrible smell, the Denver Post reports. 

He had been reported missing almost a month earlier. Investigators found that Komisarchik pressed the emergency button in the elevator twice within 8 minutes on the morning of July 6 but received no response despite the city's requirement for emergency notifications to be closely monitored. The elevator led to a parking garage that was closed for renovations.

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Photo: Denver Police Department