SHEBOYGAN, Wis. -

A medical examiner has testified that a slain 78-year-old Wisconsin woman was struck at least 27 times with sharp and blunt objects.

Fond du Lac County Medical Examiner Doug Kelley testified Tuesday at the homicide trial of 14-year-old Nathan Paape of Sheboygan.

Kelley performed the autopsy on Barbara Olson, who was killed in her Sheboygan Falls home last September. Kelly says his number of strikes is conservative.

Sheboygan Press Media reports jurors were shown photos of Olson's body. The images showed gashes and fractures to her head, face, arms and hands.

Paape and his friend, Antonio Barbeau, are accused of attacking Olson with a hatchet and a hammer.

   The defense has argued that Paape was a bystander as Barbeau killed his great-grandmother. Barbeau has pleaded no contest to first-degree homicide.