MORE: Court date set for man charged in Fairfield homicide
A Butler County grand jury indicted Armstrong for murder, attempted murder, felonious assault, having weapons under disability and tampering with evidence.
On July 27, Armstrong pleaded guilty to voluntary manslaughter with a guns specification, felonious assault with a gun specification and having weapons under disability. He faces a total of 28 years in prison.
Common Pleas Judge Jennifer McElfresh has set sentencing for Sept. 7.
In September, Armstrong was declared incompetent to stand trial by McElfresh after a forensic psychological evaluation.
Armstrong was ordered to undergo treatment at Summit Behavioral Healthcare. In February, the court found Armstrong had been restored to competency.
Defense attorneys then entered a not guilty by reason of insanity plea on their client’s behalf, but that plea was later withdrawn.
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