Gary and Felicia Kennedy were arrested in Dumas, Texas on Monday.
Authorities believe the two set fire to a Fort Walton Beach mobile home on May 2, killing Loretta Stanley.
Stanley shared the mobile home with her boyfriend and the Kennedy’s. Authorities say Felicia and Stanley had argued all day before the fire.
Both Felicia and Gary Kennedy are facing possible life sentences. There is no word on when they'll be extradited to face those charges.