A man who was found not criminally responsible for the beheading death of his mother has been located by police, two days after he escaped from a mental health centre in downtown Toronto.

Thomas Brailsford, 54, was given a day pass to leave the Centre for Addiction and Mental Health on Monday morning, then failed to return to the Queen Street West campus.

When he was reported missing, police said they were concerned for his safety.

Due to the length of time he was out of care, police warned Wednesday afternoon that the public should not approach him, but instead call 911 immediately.

On Wednesday evening, police said he had been located and was back in custody.

Brailsford was charged with first-degree murder in 2010, after his 78-year-old mother Barbara Starkey-Brailsford was found beheaded in her west-end apartment.

He was found not criminally responsible for her death.