In Morgan City, Louisiana in 1927, Ada LeBoeuf's husband, Jim, went missing. Once the waters of the Mississippi River started to recede from the Great Mississippi River Flood, his body was found. It was a quick whodunit once he was identified, though the that would be held responsible would make sure they all gave different accounts of what happened.
Sources for this episode:
Wikipedia - Gigging
Wikipedia - Morgan City, Louisiana
City of MC - City of Morgan City
Find A Grave - James Joseph Clodomire LeBoeuf
Geni - Ada Regina LeBoeuf (Bonner)
Family Search - article
NY Daily News - A Flood of Evidence: Great Mississippi River Flood of 19927 uncovered man's brutal murder
Vermilion Today - Tragic Story of Ada LeBouef, Dr. Thomas Dreher