LOS ANGELES, Calif.–A man pleaded not guilty today to murdering his 87-year-old grandmother at the South Los Angeles home he shared with her.

Brent Lamont Thomas, 43, is charged in Tuesday’s slaying of Ethel Porter.

The criminal complaint alleges that Thomas used a deadly and dangerous weapon–a broomstick–in the commission of the crime.

He is also charged with one count of assault with a deadly weapon against his mother.

Thomas–who allegedly barricaded himself for several hours in a shed behind the home–was arrested shortly before 6 p.m. Tuesday by the Los Angeles Police Department’s South Bureau Homicide.

He remains jailed on just over $1 million bail pending his next court appearance Dec. 14 at the downtown Los Angeles courthouse.