It's still unclear whether accused assassin's attorney plans to pursue a mental health defense now that his not guilty plea has been made.

The man charged with killing the top Democrat in the Minnesota House and her husband, and wounding a state senator and his wife, pleaded not guilty Thursday in federal court.

Vance Boelter, the suspected assassin accused of gunning down two Minnesota lawmakers and their spouses, killing one couple, is expected to plead not guilty during his arraignment in federal court