( CNN ) -- The sisters of an Iowa politician were found shot to death at their Pennsylvania home last week , according to Pittsburgh police . The bodies of Sarah and Susan Wolfe -- the sisters of Iowa state Rep. Mary Wolfe -- were found in their basement Friday after officers were sent to the home to check on the well-being of one sister when she did n't show up for work . Each died of a single gunshot wound to the head , and their deaths were ruled homicides , the Allegheny County medical examiner 's office said Monday . On Facebook , Mary Wolfe thanked those who had extended their sympathies , saying the family was `` heartbroken , but grateful . '' Mary Wolfe is the oldest of eight children , according to her website . Police have n't identified a motive for the shootings . A car belonging to the women was missing but was recovered early Saturday , police said .
NEW : Each died of a single gunshot wound to the head , medical examiner 's office says . one sisters of Pittsburgh state Rep. Susan Wolfe were found shot to death last week . Iowa police have n't identified a motive for the shootings .