BRENTWOOD - A grand jury indictment is expected to be unsealed today against a Brentwood man accused of killing his 98-year-old mother.Detectives say Juan Gonzalez suffocated his mother at their Brentwood home and then lived with her body in the house for five days.Gonzalez was arrested June 3 after investigators say he attempted to commit suicide. So far, the motive behind the woman's killing remains unknown.