Deputies are seeking a white SUV that was seen in the neighborhood the morning Bishop was killed, WVLT reported.
"We continue to work tirelessly and around the clock to bring the party, or parties, responsible for the murder of a U.S. Soldier to justice, and to provide the Bishop family with some form of closure," Loudon County Sheriff Tim Guider said in a statement. "Jacob Bishop was a father of two, and one of our Nation's guardians."
In a Facebook post, Bishop's fiancée, Brittany Kindred, wrote "God has one amazing angel by him now.
And I have a precious guardian angel."