A Lancaster man who allegedly fatally beat his 93-year-old great-aunt with a baseball bat at their home was scheduled to be arraigned this week on a murder charge.

Marc Robert Ellison, 36, was expected to appear in a Lancaster courtroom in connection with the Nov. 7 slaying of Mildred Mary Jensen.

Jensen was killed Nov. 7 in the 44200 block of 23rd Street West, according to Deputy District Attorney SuSu Scott.

Los Angeles County sheriff’s deputies went to the home following a report of an assault with a deadly weapon and found the woman, who suffered blunt force trauma to her upper body, Deputy Charles Moore said.

Ellison was detained at the scene, and a weapon was recovered, authorities said.

He has remained behind bars since his arrest that day, according to jail records.

Ellison could face up to 26 years to life in state prison if convicted of the murder charge and an allegation that he used a bat as a deadly weapon.