The Martinsburg Police Department says Rodney Canby was arrested by the Marion County Sheriff's Department in Marion, Florida as a fugitive from justice.
Canby is being held in Florida and waiting extradition back to West Virginia.
The two other suspects, James William Exline and Amy Lynn Burcker are still on the run.
The fire destroyed a mobile home and killed a dog.
Copyright 2015 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.