The Ottumwa Police Department announced an arrest took place Tuesday morning, in connection with the death of a woman found in the Des Moines River in Wapello County. Police charged 61-year-old Gregory Allen Showalter with first-degree murder and felon in possession of a firearm in connection with the death of his wife, 60-year-old Helen Elizabeth Showalter.

Helen Showalter’s family reported her missing Saturday. Her body was located one day later. Police said Gregory Showalter turned himself in to authorities and that a preliminary investigation found his wife’s death was “the result of foul play.”

The death remains under investigation by the Wapello County Sheriff’s Department, Iowa Division of Criminal Investigation and the Ottumwa Police Department.