DENVER (KDVR) -- The Denver District Attorney’s Office said Michael Close, the man accused of killing 21-year-old Isabella Thallas on June 10, 2020, pleaded not guilty by reason of insanity on Monday.
Close is accused of firing at least 24 shots from a high-powered semi-automatic rifle, killing Thallas and injuring her 27-year old boyfriend Darian Simon, who was shot twice in his legs but survived.
The couple was walking their dog around 11:40 a.m. when Close opened his apartment window and allegedly yelled, “Are you going to train that f---ing dog or just yell at it?”
A Denver Police homicide detective testified in a preliminary hearing in November that the shooting followed an exchange of angry words between Close and Simon after Simon's dog defecated in a rock garden outside Close's apartment complex at 3001 Fox St. in the Ballpark neighborhood of Denver.
Close is charged with two counts of first-degree murder; two counts of criminal attempt to commit murder; two counts of first-degree assault; six counts of using a prohibited large-capacity magazine during the commission of a crime; three counts of possessing a prohibited large-capacity magazine; one count of disorderly conduct; and four counts of the sentence-enhancing charge of crime of violence.