MILWAUKEE (CBS 58) -- The Milwaukee County Medical Examiner's Office identified the names of the mother and daughter killed in a south side fire. 

The fire happened Wednesday, April 12 near 19th and Burnham Streets. 

The ME's report says 27-year-old Maria Castillo Cortez and her 1-year-old daughter, tentatively identified as Maria Chavez Castillo, were in an upstairs unit when the fire started. 

Investigators believe the fire may have been sparked by a charcoal grill on a back porch. 

The fire spread to three other homes. 

The ME's office was able to identify the 27-year-old victim via fingerprints.