Police issued the grim update to the story on Tuesday.
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SFPD were called to 25th Street and South Van Ness Avenue last Friday at around 5 a.m. for a report of aggravated assault with fire.
The homeless man, who has not been identified, was 43-years-old. At the time, he was able to tell responding police and paramedics that his sleeping bag was on fire when he woke up.
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He was taken to the hospital for treatment. It was originally reported he sustained injuries to his lower extremities and was taken to a local hospital with non-life-threatening injuries.
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Police are asking for anyone with information to contact their investigations bureau. You can text TIP411 (847411) and start with keyword SFPD. Anonymous tips can be sent to (415) 575-4444.