Fifth person arrested in connection with homicide of N.S. teen Devon Marsman

Devon Marsman, 16, was reported missing to Halifax Regional Police on March 4, 2022. (Halifax Regional Police)

A fifth person has been arrested in connection with the homicide of Nova Scotia teenager Devon Sinclair Marsman.

Police say 40-year-old Mark Douglas Robert Doyle was arrested around 7:30 a.m. Thursday.

Doyle is scheduled to appear in Halifax provincial court Friday to face a charge of accessory after the fact to murder.

4 people previously charged

Four people have been previously charged in connection with the case.

Treyton Marsman, 26, has been charged with:

• second-degree murder
• indignity to human remains
• obstructing justice

Emma Maria Meta Casey, 23, has been charged with:

• accessory after the fact to murder
• indignity to human remains
• obstructing justice

Chelsey Herritt, 26, has been charged with:

• accessory after the fact to murder
• indignity to human remains

And a 20-year-old man, who was a youth at the time of the murder, has been charged with:

• accessory after the fact to murder
• obstructing justice

Marsman disappeared in 2022

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

He was 16 at the time.

Police initially said they had no reason to suspect foul play in his disappearance. However, police later determined his disappearance was suspicious.

Remains identified

Last week, Halifax Regional Police said human remains found last year have been positively identified as Marsman’s.

Investigators found the remains in September 2024. They were then sent to the Nova Scotia Medical Examiner Service for identification.

That month, police confirmed Marsman had been the victim of a homicide and the remains were believed to be his.

Investigation still open

Police say their investigation remains open.

They believe there are people who have information on the case who have not yet spoken them.

Halifax Regional Police is asking anyone with information about Marsman’s homicide to call them at 902-490-5020.

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