HAYWARD, Calif.—Hayward police have arrested a 46-year-old man on suspicion of using a screwdriver to fatally stab the mother of his children.

Police say 46-year-old Rose Marie Goulart was stabbed Friday morning outside the medical office where she worked in Hayward as more than a dozen people watched.

Officers called to the scene arrested Luis Albert Hernandez of Castro Valley after witnesses pointed him out.

Hayward police Capt. Darryl McAllister says Goulart was taken to an Eden Medical Center in Castro Valley where she was pronounced dead.

McAllister says Hernandez and Goulart have two teenage children together, but are not married.

Hernandez is scheduled to be arraigned Monday.