MORGAN CITY — The Louisiana State Fire Marshal's Office is investigating a fatal structure fire that occurred on Sixth Street in Morgan City early Saturday morning. 

According to the Morgan City Fire Department, the fire began around 4 a.m. when a passerby noticed an unconscious victim at the doorstep of the structure before moving the victim to a safe area and rendering aid until the Morgan City Police Department's arrival. 

Fire officials said the victim later died from his injuries. 

Upon fire crews' arrival, firefighters performed an aggressive attack while conducting a primary search. 

Due to the significant fire spread, reports of unknown additional occupants and nearby structures, the Berwick Fire Department was contacted for additional assistance. 

The cause of the fire is under investigation by the Louisiana State Fire Marshal's Office.