Nova Scotia

5th person charged in killing of Halifax teen Devon Marsman

A fifth person has been charged in connection with the disappearance and killing of a Halifax teen three years ago.

Mark Douglas Robert Doyle, 40, faces charge of accessory after the fact to murder

A photo of a boy is seen on a missing person poster.
Devon Sinclair Marsman, 16, was last seen on Feb. 24, 2022. (CBC)

A fifth person has been charged in connection with the disappearance and killing of a Halifax teen more than three years ago.

Devon Sinclair Marsman was last seen on Feb. 24, 2022, in the Spryfield area of Halifax, and was reported missing on March 4, 2022.

Halifax Regional Police say 40-year-old Mark Douglas Robert Doyle was arrested on Thursday morning and charged with accessory after the fact to murder.

Doyle was scheduled to appear in Halifax provincial court Friday.

Treyton Alexander Marsman, 26, was charged last year with second-degree murder, indignity to human remains and obstruction of justice.

A man in a red hoodie looks toward the camera. The arm of a court sheriff is visible in the right side of the frame.
Treyton Alexander Marsman is facing charges of second-degree murder, indignity to human remains and obstruction of justice. (Craig Paisley/CBC)

A 20-year-old man is facing charges of accessory after the fact to murder and obstructing justice. He cannot be named under the Youth Criminal Justice Act because he was a youth at the time of the homicide.

Emma Maria Meta Casey, 23, is facing charges of accessory after the fact to murder, indignity to human remains and obstructing justice.

Chelsey Herritt, 26, has been charged with accessory after the fact to murder and indignity to human remains.

Last week, police announced that remains found last September were confirmed to be that of Marsman. Where the remains were found is not being released as court proceedings are ongoing.

At a news conference last September, Chief Don MacLean confirmed there is a "familial relationship" between Devon Marsman and Treyton Marsman, but would not elaborate.

Devon Marsman's family has long fought for justice in his case. A rally was held on what would have been his 18th birthday in October 2023, calling on police to do more to find out what happened to the teenager.

A crowd of people are walking down the side walk holding signs.
People walked through a west Halifax neighbourhood chanting 'Bring Devon Home!' during a rally for the Halifax teen in 2023. (Jeorge Sadi/CBC)

Police initially said there was no indication to suggest Marsman met with foul play.

But nearly eight months later, police said publicly they considered Marsman's disappearance suspicious. Investigators then announced last September that his death was considered a homicide.

In November 2022, Nova Scotia's Department of Justice offered up to $150,000 for information leading to an arrest and conviction of those responsible for the teenager's disappearance. Last April, the reward was increased to $250,000. 

Anyone with information about the homicide is asked to call police at 902-490-5020.

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