BOSTON (CBS) – A 59-year-old woman died early Saturday morning after flames broke out a multi-family home in South Boston. The fire started around 5 a.m. on East 8th Street.

The scene of a fatal South Boston fire. (WBZ-TV)

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Four people were home at the time. Three people were displaced and one woman died.

One of them is Michael Sullivan, who said he did what he could to rescue the woman. “Pounding on the door, no answer. We get the key, can’t get in. The wall of smoke and the heat was unbelievable,” he said.

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Flames were contained to the first floor. The fire caused about $200,000 in damage.

No one else was on the first floor beside the woman. “She was intelligent, always willing to chat and she wanted to always help,” said Sullivan. She also owned the building, he said. “She was a sweetheart.”

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A cause has not been determined, but it is not believed to be suspicious.