Detectives say they've issued an arrest warrant for a 29 year old Elwood Billiot.
They believe he's the man who set fire to a home on sunset drive here in Lafayette.
Firefighters found the body of 73 year old Sidney Touchet inside.
Touchet is currently being held in the Terrebone Parish Jail on unrelated charges as well as the first degree murder charge.
They say Billiot was arrested in Terrebone Parish where touchet's Ford Mustang was recovered.
This investigation continues tonight.