A career spent prosecuting the worst predators in St. Clair County history also meant  consoling countless victims and their loved ones.  Many of the young people Judge Armstrong has helped throughout her career are now adults, working and raising their own families in our community.  Judge Armstrong helped them gain their voice and achieve justice. 

Judge Armstrong also exhibited that kind of compassion in hundreds of District Court matters over her twenty-five year career.  

These experiences uniquely position her to understand the circumstances of the parties appearing in her courtroom.  These experiences gave Judge Armstrong the kind of compassion and empathy that does not come from merely observing things in court, but rather from actually doing things in court. 

Mona received her B.A. from Michigan State, and a J.D. from Wayne State University.  While in law school, she completed internships for the Macomb County Prosecutor’s Office, the U.S. Attorney’s Office – Eastern District, and with the Honorable Avern Cohn (Federal District Court).  She graduated in 1994, and worked as a law clerk for the Honorable Peter E. Deegan in the 31st Circuit Court of St. Clair County. 


Prior to being appointed to the bench, Mona served in the Major Crimes Unit of the St. Clair County Prosecutor's Office, handling homicide and other high profile cases.  Additionally, for numerous years she was responsible for the Special Victim’s Unit handling Child Criminal Sexual Conduct and Physical Abuse cases.  


Since she began her tenure as a St. Clair County Assistant Prosecuting Attorney in 1995, Mona prosecuted over 100 jury trials, including over 60 cases involving Capital crimes and Criminal Sexual Assault. As the head of the Major Crimes Unit, she proudly tried over 20 murder cases - securing convictions in every single case.

Mona also served as adjunct faculty for the Criminal Justice Department at St. Clair Community College.  She is a frequent faculty member and lecturer for the Prosecuting Attorneys’ Association of Michigan (PAAM).  She has served on multiple PAAM Committees, including the Justice Initiative - Best Practices Committee, Cold Case Committee and Panel, and Child Abuse Advisory Committee.


Judge Armstrong has held critical roles in our community in the positions of Senior Assistant Prosecuting Attorney, and now District Court Judge.  The responsibilities of these positions are immense.  

However, while it is an honor and privilege to have held those titles, neither compares to the titles of wife and mother.  The Armstrong family is Judge Amstrong's most treasured achievement.

Mona has been married to husband Todd for over 20 years.  Todd serves the citizens of St. Clair County as a Parole/Probation Supervisor for the State of Michigan.  Todd is not only a wonderful husband, great dad, and hardworking public servant, in 2003, Todd also graduated law school, which he attended while working full time. In May, 2004, Judge Armstrong presented the motion to admit Attorney Todd Armstrong to the Michigan bar. 

Todd and Mona's daughter Alysse is a 2019 graduate of Port Huron Northern. She stuck with the maize and blue of PHN when she entered the University of Michigan last fall. 


Todd and Mona’s 15 year old son, Alex, is also a proud Husky.  Alex is active in basketball, baseball, and football. 


For twenty-five years no victim, particularly vulnerable children, had a better friend and advocate than Mona Armstrong.  Time and again she has been trusted by her superiors to handle the most heart-wrenching and high-profile prosecutions in St. Clair County history. Judge Armstrong gained a reputation as a tough, “no nonsense” prosecutor.  That is true for the murderers, abusers, and rapists she prosecuted.  But what the public did not see behind the headlines was her heartfelt compassion toward rape victims, abused women, molested children and the surviving loved ones of murder victims.


One demonstration of this is when Mona successfully prosecuted former Port Huron Mayor Ajax Ackerman, who used his position to manipulate the community into believing a story of reformation, and the idea that he wanted to help community youth.  Far from that story is the truth, which is that he exploited trust to prey upon children.  Sr. Assistant Prosecuting Attorney Mona Armstrong convinced a jury to find Ackerman guilty as charged and he served over 20 years in prison.

Mona has consistently demonstrated the focus and ability to make hard and just decisions under pressure. Just a few cases representative of those skills critical to this court are highlighted here​.

Mona's dedication to the safety of our community has repeatedly ensured that Justice is served for the citizens of St. Clair County. 




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