Prosecutors said Sergio Martinez-Perez beat and sexually assaulted 93-year-old Louise Sollowin in her home Sunday. Sollowin died Wednesday.
Douglas County Attorney Don Kleine on Thursday said Martinez-Perez will be charged with first-degree murder.
Autopsy results showed that Sollowin's cause of death was blunt force trauma.
Martinez-Perez, who already faces charges of first-degree sexual assault, first-degree assault and burglary, is set to appear before a judge Friday to be arraigned on the new charge.
Police: Elderly woman who was beaten, raped dies | Local News - KETV Home