A man accused of aiding his sister’s plan to kill her former boyfriend pleaded not guilty by reason of mental disease.
Derrick Matthews and his sister Donna Matthews appeared in court Friday for their arraignments. Each entered a not guilty plea. However, while Donna Matthews entered a standard not guilty plea, Derrick Matthews, through his defense attorney Terry Rose, indicated that they would use an insanity defense in the case.
“He has a long psychiatric history,” Rose said of his client after the hearing. “He is a veteran and he has been treated by a number of psychiatrists” through veterans programs, Rose said.
Donna Matthews is accused of shooting and killing Michael Gayan on July 4. His body was found in his house on the 300 block of 59th Place several weeks later.
The investigation led police to the Matthewses because of past history of domestic violence allegations by Donna Matthews against Gayan. In interviews with police, according to past testimony, Derrick Matthews told detectives that his sister had travelled from her home in Hawaii to Kenosha to kill Gayan, hiding in the house and shooting Gayan five times when he came in.
He admitted giving her the gun she used, and to driving her to Gayan’s home.
On Friday prosecutors also added charges for both. Donna Matthews was charged with burglary armed with a dangerous weapon, in addition to the existing first degree homicide. According to past testimony, she took Gayan’s cell phone when she left his house.
Derrick Matthews was charged with burglary while armed with a dangerous weapon, party to a crime, and with harboring or aiding a felon.
The brother and sister are expected back in court Oct. 27.