Neeson was crouched down in the back of the ambulance watching as she was loaded, according to the Toronto Star.
Tuesday, the Mont Tremblant ski resort, released the following statement regarding her accident:
"Natasha Richardson fell in a beginners trail while taking a ski lesson at Station Mont Tremblant," the statement said. "She was accompanied by an experienced ski instructor who immediately called the ski patrol. 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.
"As an additional precautionary measure, the ski instructor as well as the ski patrol accompanied Mrs. Richardson to her hotel," the statement continued. "They again recommended she should be seen by a doctor. The ski instructor stayed with her at her hotel. Approximately an hour after the incident Mrs. Richardson was not feeling good. An ambulance was called and Mrs. Richardson was brought to the Centre Hospitalier Laurentien in Ste-Agathe and was later transferred to Hôpital du Sacre-Coeur."
A spokesperson for the resort noted Richardson was not wearing a helmet while skiing and didn't collide with anything when she fell. Thursday, in the wake of her death, Quebec officials said they are considering making helmets mandatory on ski slopes, according to The Associated Press.
Neeson, 56, left the set of "Chloe," a movie he was filming in Toronto, and rushed to his wife's side upon learning the news.
"'Chloe' will continue with its production schedule focusing on scenes which feature other cast members," the publicist for the film said in a statement to "Entertainment Tonight." "There are some scenes with Liam Neeson which have not been completed, however, we do not feel this is the time to address that matter. Our concern is for Liam and his family at this difficult time."
Richardson had two sons with Neeson, Michael, 13, and Daniel Jack, 12.
Following the news of Richardson's death, friends in Hollywood reflected on her career and legacy.
"Tash was the warm sun in the center of a large constellation of family, friends, all of those lucky enough to know her," Meryl Street said in a statement to ABC News. "She is irreplaceable in our lives; she gave us so much, so generously -- her legacy is the love that connects us all."
Lindsay Lohan, who co-starred with the actress in 1998's "The Parent Trap," released the following statement through her publicist.
"She was a wonderful woman and actress and treated me like I was her own," Lohan's statement said. "I didn't see much of her over the years but I will miss her. My heart goes out to her family. This is a tragic loss."
Jane Fonda wrote about Richardson on her blog, saying that she met the actress on a movie set when Richardson was just a child.
"I first met her on the set of Julia [in which she starred with Vanessa Redgrave]. She was a little girl but already beautiful and graceful. It didn't surprise me that she became such a talented actor," Fonda said.
Ralph Fiennes appeared with the actress in the 2005 period drama "The White Countess."