A Kingsport Woman Who Was Allegedly Beaten By Her Ex-Boyfriend Has Died. Sullivan County Sheriff’s Captain Andy Seabolt Says 37 Year Old Melissa Mingle Passed Away Yesterday Afternoon. Charges Against 30 Year Old Nathaniel White-Young Have Been Upgraded To First Degree Murder And Aggravated Arson. Mingle Was Found Lying In The Front Yard Of Her Home On Fordtown Road Sunday Afternoon. She Reportedly Suffered A Severe Head Injury And Possibly Broken Bones. White-Young Was Arrested A Short Time Later In Hamblen County. He’s Expected To Be Brought Back To Sullivan County Soon.