R.I.P. Natasha Richardson

Sources: Natasha Richardson Brain Dead After Ski Accident

Sources close to Tony-award winning actress Natasha Richardson tell FOXNews.com that the 45-year-old actress is brain dead, and being transported back to New York City before she is to be taken off life support.

Richardson's condition deteriorated following a skiing accident on Monday on a beginner's trail at the Mont Tremblant ski resort in Quebec, Canada.

A spokeswoman for Montreal's Sacré-Coeur hospital, where Richardson was transferred after being sent initially to nearby Centre Hospitalier Laurentien in Ste-Agathe, said a family representative was expected to release a statement Wednesday.

The Toronto Star said one of their reporters witnessed Richardson, heavily wrapped in blankets, "in an intensive-care bed, tubes covering her face," as she was put into ambulance in Montreal shortly after noon.

The Star said her husband, actor Liam Neeson, was crouched down inside the back of the ambulance, and "looked extremely worried."

Richardson was first reported in serious condition with a head injury by multiple outlets early Tuesday.

"We know that she has had an accident but we really do not know any more details," said Kika Markham, who is married to Richardson's uncle, Corin Redgrave. "We are very concerned."

Neeson left the set of a movie he was filming in Toronto to be by his wife's side.

"Liam Neeson left the Toronto set immediately to fly to Montreal upon news of his wife’s accident," a rep for his film said in a statement to Canadian TV. "We do not have any details at this time but we hope for the best and our thoughts and prayers are with Natasha and Liam and their family."

Neeson's reps told FOXNews.com they had "no information at this time regarding this matter."

Mont Tremblant said Richardson fell on a beginner's trail during a ski lesson and later reported not feeling well. She was not wearing a helmet, nor was one required, they said.

"She did not show any visible sign of injury, but the ski patrol followed strict procedures and brought her back to the bottom of the slope and insisted she should see a doctor," said a statement from the resort.

Mont Tremblant spokeswoman Catherine Lacasse said Richardson was getting a private lesson and that she said she was fine at first.

"An hour later she said she didn't feel well. She had a headache, so we sent her to the hospital," Lacasse said. "There were no signs of impact and no blood, nothing."

Richardson, is the daughter of actress Vanessa Redgrave and the late director Tony Richardson. She married Neeson in 1994 after they both appeared in the film "Nell." The couple have two sons.

In January, Richardson and her mother played the roles of mother and daughter in a one-night benefit concert version of "A Little Night Music," in New York.