St Paul (Learfield News Service) -  A 27-year-old woman and her two year-old son killed in a duplex fire in Saint Paul have been identified asTiffany and William Alexander.

Relatives disclosed the names on a Go Fund Me account to help Tiffany's family.

State and local investigators are looking into the cause of the fire, in which the mother succumbed to smoke and flames. Her son William died Wednesday night at a hospital. Tiffany Alexander's mother Tessi and young nephew Gabe were hospitalized in critical condition.

The Go Fund Me page says it's raising money for burial, medical costs, and costs for raising Alexander's three-year-old daughter who was with her father at the time of Wednesday morning's fire.

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