Neighbors found the infant Tuesday, after hearing a sound coming from their trash can.
The Clarksville Police Department said Wednesday they have arrested three people in connection with a recent homicide.
Jimmy Boyer, 53, was found dead May 18 on West Fork Drive.
Arrested were Coray Knight, 38, and Frederick Persinge, 65, both from Clarksville, and Kelly Hufford, 45, of Oak Grove KY.
Detectives are still looking for a fourth person described as a white man, wearing a ball cap, who was seen with Knight the day of Boyer's death.
The public is urged to contact the Clarksville Police Department with any information concerning the case.
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