An inmate serving a life sentence for second-degree murder has escaped from a minimum security prison unit in Kingston, Ont.

Ontario Provincial Police say Cale David Presnail was last seen around 5 p.m. Monday at the minimum security unit of the Collins Bay Institution. Staff realized he was missing during a 9 p.m. head count.

According to a news release from Correctional Service Canada, Presnail, 40, is a white male who is six feet, one inch tall and weighs 210 pounds. He is bald, with a long goatee, a fair complexion and hazel eyes.  

He has a brown birth mark on his left forearm, a tattoo of two swords on his left upper arm, a tattoo of a dragon on his right calf and a tattoo of a dolphin on his right upper arm.

The OPP say Presnail was convicted of second degree murder in 1998.

Anyone who sees him is asked not to approach him and call 911 immediately.