A 26-year-old man committed to a Toronto mental health facility for trying to kill his father is on the loose after giving staff the slip Wednesday afternoon.

Nathan Allen Clarke was last seen at the Centre for Addiction and Mental Health facility on Queen Street West at 2:30 p.m.

He left his medication behind. Without it, police said he suffers from mood swings and can become erratic.

Clarke was arrested in January 2004. His father, 51 at the time, was stabbed repeatedly in the back of the head and on his hands at a house on Seneca Drive in Oakville that he shared with his son.

In May 2004, Clarke was found not criminally responsible for the incident and was committed to CAMH.

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