MASTIC - Authorities say a third person has died from injuries suffered in a fatal Mastic house fire.

According to investigators, Barbara DeSouza has succumbed to her injuries. DeSouza was pulled from a fire Thursday on Broadway. DeSouza's husband Douglas and an unidentified friend were also killed.

Authorities are still trying to determine what caused the fire, but say it is not considered suspicious.

2 dead, 1 critically injured in Mastic house fire