Zachary Damien Craven pleaded not guilty Thursday morning to charges he murdered his grandmother and a short time later a friend of his former girlfriend.

The 24-year-old Kent man was arraigned in King County Superior Court in downtown Seattle on two counts of first-degree murder, with a firearms enhancement, and one count of second-degree assault.

He’s being held on $5 million bail in the King County Jail in Seattle. His next court appearance, a case-setting hearing, is 1 p.m. Sept. 22 in room 1201 of the King County Courthouse.

Craven’s grandmother, 66-year-old Angelika Anna Hayden, was found dead July 7 in her home on West Hill near Renton by his grandfather Robert W. Luxton. Just hours later, Meagan Smith was found dead in the Renton home of Rodney and Margaret Cunningham.

Smith had agreed to housesit for the Cunninghams while they were on vacation with their daughter, a good friend of Smith’s.

The assault charge stems from allegations that Craven used a gun to pistol whip and threaten his grandfather in Kent on July 2, according to prosecutors.

The charging documents filed July 10 document the case against Craven.