A mentally ill St. John's man has been sentenced to six years in prison for an armed robbery in a downtown convenience store.

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William Macaulay was sentenced to six years in prison for armed robbery. ((CBC))

William Macaulay was sentenced Tuesday during an appearance in provincial court in St. John's.

Macaulay wielded a knife during a robbery at a Queen's Road convenience store, and wore a mask. He was stopped, though, by an off-duty Royal Newfoundland Constabulary officer.

The court was told that Macaulay was institutionalized when he was nine years old. He has a Grade 4 education, has had a life-long struggle with drugs and has been diagnosed with depression.

The Crown argued that Macaulay poses a danger to the public.