Macon County fire officials are investigating a fire that claimed the lives of four people.The fire broke out around 7 p.m. Sunday at a home on Cave Hollow Road in Lafayette.Officials told Nashville's News 2 witnesses reported seeing flames, then heard an explosion.Three elderly retirees who have been identified as Robert Solomon, 80, Barbara Solomon, 73, and 65-year-old Alice Cockrill lived in the home, and were all confirmed dead.Fifty-five-year old Danny Nash was just arriving to his home across the street when he and his wife Sheila noticed the flames."We pulled up at the driveway and flames were already shooting out of the back, and he said, ‘I'm going to go get them.' I said, ‘Danny let's please call the fire department,'" said Sheila Nash.Nash never made it out of the house before it collapsed.Friends and family in the small community are remembering his heroic efforts."Danny died the way he lived. If there was anything he could do to help anybody, he was the first man you wanted to call," said neighbor Tom Dawes.Nash leaves behind a wife, daughter and granddaughter.Family information for the other three victims has not been released.State bomb and arson investigators are working the fire.Authorities believe some sort of explosion occurred, causing the home to be fully engulfed in flames within a matter of minutes.The investigation is ongoing.