Police say 45-year-old Brett Knight was located in a house on Creswell Road in Sevier County around 8:30 a.m.
Knight is being held on an extradition warrant in New York. The details of the warrant were not immediately known.
Knight was connected by Suffolk County detectives to Ross Reisner, who was fatally shot in his East Setauket home on September 24. He was hit by a shot filed through the window.
The 50-year-old Reisner was a fixture in Eastern Suffolk County's equestrian community. Knight was believed to be a former tenant.
Reisner and his longtime domestic partner, Kevin Murray, who was grazed by one of the bullets, filed a harassment complaint against Knight last month.
The September 24 shooting spurred a nationwide search for Knight, who had purchased a motorcycle and was said to be traveling throughout the country. Knight was considered armed, volatile and extremely dangerous.