Authorities are investigating the cause of a deadly excavation accident in northeast Iowa. The deadly mishap occurred Tuesday afternoon at a home in Waverly. Authorities say a contractor working below ground was killed when the trench around him collapsed.

According to Waverly police, 35-year-old Aaron Meyerhoff of Dunkerton was buried in dirt. Rescuers tried to free Meyerhoff, but did not succeed. His body was recovered from the trench about three hours later. The Bremer County Medical Examiner pronounced Meyerhoff dead at the scene.