Reporting and analysis may discuss allegations and online theories. Allegations are not findings of guilt. Verify important details in the cited public record.
THE CASE FILE
On June 11, 2020, 28-year-old Michael Montgomery was shot and killed in the 3700 block of Gelston Avenue in Baltimore. The homicide did not produce an immediate arrest. Nearly eleven months later, police announced that detectives had identified Martinez Armstrong as their suspect and charged him with first-degree murder.
At first, the case looked like a long homicide investigation that had finally reached its target. But Armstrong’s name carried a much older Baltimore history behind it, and once the murder prosecution moved into court, the public record began revealing problems that were never visible in the original arrest headlines.
THE ARREST
Armstrong was taken into custody on May 5, 2021, after detectives said their investigation into Montgomery’s death led them to him. The case eventually expanded beyond a single murder count, and prosecutors prepared to move forward in Baltimore City Circuit Court.
What the early news reports did not fully explain was just as important: what evidence first caused detectives to focus on Armstrong after almost a year, how strong that evidence actually was, and what prosecutors expected to present once the case reached trial.
The full file follows that gap from the homicide scene to the arrest.
THE EARLIER CASE
Years before Michael Montgomery was killed, Armstrong’s name had already surfaced in another Baltimore investigation involving the death of 13-year-old Monae Turnage.
That earlier case is one of the most important layers in the full file because the headline alone does not explain Armstrong’s actual alleged role, why police charged him, what evidence investigators said connected him to the case, or how the investigation eventually led to a lengthy prison sentence.
The deeper record also contains a detail involving where critical evidence was later found—one of the strangest turns in the entire file.
THE COURT RECORD
The Montgomery prosecution remained active for nearly twenty months after Armstrong’s arrest. Trial dates were set, evidence-related issues surfaced, and the case moved toward a jury.
Then the prosecution ended.
On January 9, 2023, the murder case against Armstrong was dismissed.
The preview stops there.
The full court record reveals what happened before that dismissal, what problems emerged as trial approached, why Armstrong’s DNA became part of the proceedings, and what development finally placed the prosecution in jeopardy.
THE QUESTIONS LEFT BEHIND
Police spent nearly eleven months investigating before arresting Armstrong. Prosecutors carried the case for almost two more years. A first-degree murder charge remained active, court proceedings exposed previously unknown evidence issues, and yet the case never reached a completed jury trial.
The full case file breaks down the 2020 homicide investigation, the separate 2012 case involving Monae Turnage, Armstrong’s prior prison history, the murder charges, the DNA-related court issue, the trial delays, the dismissal, and the unanswered questions that still sit inside the public record.
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