Commonwealth v. Muller

During an armed home invasion of an apartment in Dudley, the defendant, Christian Muller, and an accomplice 1 shot and killed two of the occupants and critically wounded a third. After a jury trial, the defendant was convicted of two counts of murder in the first degree, on the theories of deliberate premeditation and felony-murder, 2 armed assault with intent to murder, armed home invasion, and unlawful possession of a firearm.

At trial, the defendant admitted that he had shot the victims; his primary defense was that he lacked criminal responsibility because of mental illness and cocaine…