Detectives investigating the slaying of a 74-year-old Bethesda woman whose body was found in the kitchen of her home Sunday said yesterday they have found a 12-inch Sears Craftsman screwdriver they believe the killer or killers left behind.

Police said they believe that Rae Brown McConaghy, a widow who lived alone, may have been killed during a burglary attempt at her home, 8708 Fenway Dr. Police said she had suffered head and facial injuries, and appeared to have been killed about 10:30 a.m. Saturday.

The screwdriver has the initials "B.J." etched on three spots on the handle, which is made of clear plastic, with red vertical stripes and blue end, according to Lt. James Taylor of the Bethesda Investigation Section. He said the screwdriver is probably not the weapon used in the slaying.

Besides the screwdriver, Taylor said detectives are investigating reports of several vehicles seen in the area on Saturday, including one with a loud exhaust.

Anyone with information is asked to call 840-2444.

Another elderly woman, 80-year-old Anna Teresa Kendricks, was found slain July 25 in her home in the Forest Glen area of Silver Spring, which had been burglarized.