A Sullivan County Grand Jury Has Charged A Kingsport Couple With Murder Following The Death Of Their 4-Month-Old Infant. 23 Year Old Lucas Carter Jr. And 24 Year Old Madison Rehart, Are Each Charged With First Degree Murder And Aggravated Child Abuse/Neglect/Endangerment. The Child Was Found Unresponsive On September 15th And Was Later Pronounced Deceased At An Area Medical Facility. The Death Has Been Ruled A Homicide. Investigators Said Evidence Suggests Both Were Allegedly Responsible For The Child’s Death And Neither Sought Medical Care. Carter And Rehart Are Being Held On A $500,000 Bond.