British actress Natasha Richardson is reportedly in critical condition after suffering a serious head injury while skiing in Quebec, Canada. The 45-year-old was involved in an accident on the slopes on Monday and was taken to Montreal's Centre Hospitalier Laurentien. She was later transferred to another medical facility, according to reports. Richardson, who is married to Irish actor Liam Neeson, is under constant supervision from medics after suffering a 'traumatic brain injury,' a hospital source tells IrishCentral.com. It is not known if Neeson is by her side -- the actor's publicist Alan Nierob says that he could not confirm the reports as he was unable to reach the actor. A representative for the actress could not be reached as WENN goes to press.