St. John's psychiatrist Dr. Tom Cantwell has had his medical licence revoked. (CBC)

A well-known physician in St. John's is losing his licence for having sex with a patient.

At a closed-door hearing Tuesday, the College of Physicians and Surgeons of Newfoundland and Labrador found psychiatrist Dr. Thomas Cantwell guilty of professional misconduct.

The college said he had sexual relations with a patient between 2004 and 2008.

Cantwell spent many years responsible for mental health and addictions at the Waterford Hospital, an institution specializing in psychiatric care, before withdrawing from practice last year.

The college ordered Cantwell to surrender his medical licence and pay a portion of the costs of Tuesday's disciplinary hearing. The college also has to publish a summary of its findings.

Lawyers for Cantwell and the female patient have written an agreed statement of facts. That statement has not been released to the public.