Commonwealth v. Diaz

The defendant, John Anthony Diaz, was convicted of murder in the first degree on a theory of deliberate premeditation. On appeal, he claims that the trial judge erred in (1) denying his motion to dismiss the indictment based on the Republic *823of Guyana’s deportation of him before extradition proceedings were completed; and (2) the handling of the defendant’s mental impairment defense in (a) ordering him to submit to a psychiatric examination when he proposed offering expert testimony regarding his inability to commit the murder with deliberate premeditation; and (b) refusing to instruct the…