UPDATE: Chattanooga fire officials have identified the victim in a morning duplex fire as 66-year-old Allen Smith.

Smith has been transferred to the Joseph M. Still Burn Center in Augusta, Georgia.  He is listed in stable condition.

Chattanooga police say arson investigators are following up on the fire that seriously injured Smith and killed his pet poodle.

Chattanooga firefighters responded to a duplex fire at 2103 Daisy Street just after midnight Tuesday.

When they got there, the front of the building was engulfed in flames. Four companies battled the blaze.

"One of my neighbors came and got me -- I wasn't home -- and told me my house was on fire and one of my neighbors might be dead," said David Usry.

David Usry lived in the left side of the duplex and his neighbor and friend, Allen Smith, lived in the right. Firefighters found Allen hunched between the toilet and tub in the back bathroom. He was pulled out and given oxygen. He was taken to Erlanger unresponsive.

Usry said his neighbor had trouble getting around and often used a walker or wheelchair. Smith's pet poodle died in the fire but David's dog survived.

"The flames were just coming out the window, the roof, the door, everything," said neighbor Tarashenda Harris.

Crews got the fire under control in about 30 minutes. The American Red Cross is helping the residents. Usry said he has no insurance but is staying with his girlfriend.

It's unclear what caused the fire and the investigation is underway.