A St. Louis police officer accused of accidentally killing a female colleague while playing a variation of Russian roulette pleaded guilty Friday and was sentenced to seven years in prison.Nathaniel Hendren, 30, had been scheduled to go to trial March 23 on charges of first-degree involuntary manslaughter and armed criminal action. The seven-year sentence was the maximum for involuntary manslaughter.He was accused of fatally shooting 24-year-old Katlyn Alix, also a St. Louis police officer, at his home in January 2019 while he was supposed to be on duty elsewhere. Hendren`s male partner, also on duty, was at the home, too. Alix, a married military veteran, was off-duty at the time."The reckless behavior that took place that early morning has left an unfillable void for her grieving husband, her parents, and a host of loving family and friends," Circuit Attorney Kim Gardner said in a statement.Hendren`s lawyer, Talmage Newton IV, has called Alix`s death a "tragic accident," but