Valerie Harper suffered a health emergency Wednesday night, when she was taken away by ambulance during a performance of her musical Nice Work If You Can Get It at the Ogunquit Playhouse in Maine.
The fire department confirms to ET that they received a call at 8:56 p.m. about an unconscious 75-year-old female backstage, and that she was taken to York Hospital. According to Ron Corning, anchor and correspondent at ET's affiliate in Dallas WFAA, around 9:40 p.m., the artistic director of the musical announced to the audience that the ambulance seen on the side of the lawn was for the 75-year-old actress, and that she had fallen ill and wouldn't be performing.
IMAGE DISTRIBUTED FOR AARP - Valerie Harper arrives at the AARP Movies for Grownups Film Showcase at Regal Cinemas L.A. LIVE on Friday, November 7, 2014 in Los Angeles. (Photo by Vince Bucci/Invision for AARP/AP Images)
Photo by: Dennis Van Tine/STAR MAX/IPx
Valerie Harper at the American Lung Association's launch of Lung Force - a national public health initiative to fight lung cancer in women.
Actress and cancer survivor Valerie Harper, testifies before a Senate Special Committee on Aging hearing to examine the fight against cancer, focusing on challenges, progress, and promise, on Capitol Hill in Washington, Wednesday, May 7, 2014. (AP Photo/Manuel Balce Ceneta)
Committee Chairman Sen. Bill Nelson, D-Fla., left, and actress and cancer survivor Valerie Harper exchange greetings before the start of a Senate Special Committee on Aging hearing to examine the fight against cancer on Capitol Hill in Washington, Wednesday, May 7, 2014. Ranking member Sen. Susan Collins, R-Maine, right, and National Institutes of Healthâs National Cancer Institute Director Harold Varmus, back left, watch. Harper told Sen. Nelson that he still looks like "a little cute beach boy." (AP Photo/Manuel Balce Ceneta)
Valerie Harper arrives at the 82nd Annual Hollywood Christmas Parade, on Sunday, Dec. 1, 2013 in Los Angeles. (Photo by Richard Shotwell/Invision/AP)
Valerie Harper attends the "Lung Cancer: Bring On The Change!" Event on Sunday, Sept. 29, 2013, in Los Angeles. (Photo by Todd Williamson/Invision/AP)
FILE -This May, 16, 2012 file photo, shows actress Valerie Harper at the Friars Club Roast of Betty White in New York. The 1970s sitcom star has been diagnosed with a rare brain cancer. Harper defied odds with her survival and will be one of the 12 upcoming contestants on the 17th season of âDancing With the Stars.â (AP Photo/Charles Sykes, File)
Valerie Harper arrives at the 61st Annual Tony Awards in New York, Sunday, June 13, 2010. (AP Photo/Peter Kramer)
Actress Valerie Harper attends 'The Heart Truth's' Red Dress Collection 2010 fashion show on Thursday, Feb. 11, 2010 in New York. (AP Photo/Evan Agostini)
Valerie Harper, left, and Betty White arrive at the 13th Annual Screen Actors Guild Awards on Sunday, Jan. 28, 2007, in Los Angeles. (AP Photo/Reed Saxon)
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Valerie Harper at "The Second Annual TV Land Awards: A Celebration of Classic TV".
(Hollywood, CA) (Star Max via AP Images)
Actors Betty White, left, Georgia Engel, second left, Gavin MacLeod, center, Valerie Harper, second right, and John Amos pose for photographers during arrivals at CBS's 75th anniversary celebration Sunday, Nov. 2, 2003, in New York. (AP Photo/Louis Lanzano)
Actress Valerie Harper, front center, crosses her fingers as she and others, including actress Sally Kirkland, rear left, await results of a vote on whether the Screen Actors Guild and the American Federation of Television and Radio Artists should consolidate, Tuesday night, July 1, 2003, in Los Angeles. Harper and Kirkland were both opposed to the consolidation. The proposal was narrowly defeated when members of both organizations voted in favor of consolidating but not by the 60 percent yes vote required. (AP Photo/Rene Macura)
Former cast members of the Mary Tyler Moore Show, sans Mary Tyler Moore, are reunited for the Museum of Television and Radio's 9th annual Television Festival in Los Angeles Saturday, March 21, 1992. From left are Gavin MacLeod, Valerie Harper, Cloris Leachman, Betty White and Ed Asner. (AP Photo/Craig Fujii)
Valerie Harper, left, Ed Asner, center, and Sally Struthers hold their Emmys at the 24th annual Primetime Emmy Awards presentation in Hollywood, Ca., Sunday night, May 14, 1972. Harper and Asner won best supporting actress and actor, respectively, in "The Mary Tyler Moore Show." Struthers won for her role in "All in the Family." (AP Photo)
Actress Valerie Harper, left, and actor Ed Asner pose with their Emmy statuettes at the annual Primetime Emmy Awards presentation in Los Angeles, Ca., May 9, 1971. Harper won best supporting actress and Asner won best supporting actor for their role in a comedy performance for "The Mary Tyler Moore Show." (AP Photo)
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The director then said, "She wants all of you to know after some fluids and rest she hopes to be right back here on stage later this week."
However, a source close to the situation tells ET, "Just know it's very bad."
Corning also spoke to the art tech on site, who said that Valerie has not been well all week.
The Mary Tyler Moore Show star only appears in the second act of the play, and is set to perform through August 15.
Valerie was diagnosed with terminal brain cancer in 2013, after previously beating lung cancer in 2009. In April, she told ET that her cancer has not spread to other parts of her body, though pointed out that contrary to reports, she has not been "cured."
"In a way, it's a positive thing to know that a year's gone by and it's nowhere else in my body," she said. So I am cancer free from the neck down, so far."
Watch below as Valerie sets the record straight on her cancer diagnosis: