Cook County prosecutors Friday announced an indictment against a Barrington man charged with fatally shooting his estranged girlfriend last month.William R. Zientek, 46, is charged with first-degree murder in the Nov. 17 death of Vernon Hills endocrinologist Olga Duchon, who is the mother of their young child.Zientek, who was remanded to Cook County Jail, will be arraigned Jan. 9 in Rolling Meadows.After inviting Duchon to his home for a discussion, prosecutors say Zientek struck her twice in the head with a baseball bat and shot her with a gun he had previously reported stolen. Zientek's attorney, Thomas Glasgow, says his client acted in self-defense. Related Barrington man ‘savagely’ beat doctor with bat before shooting her in front of their child prosecutors say Suspect held in shooting death of Barrington diabetes doctor According to prosecutors, the couple was conversing in Zientek’s living room when he struck and shot her. Officers responding to Zientek’s 911 call found Duchon laying on her side with a child’s blanket over her. They recovered a 9 mm handgun, spent cartridges and a baseball bat. In the attached garage, officers found a backpack containing 9 mm bullets and an empty holster.For more, go to dailyherald.com.