His mother, Elizabeth Jackson, first posted about the accident, which apparently happened Friday night near Reno, Nev., on Saturday. "Please pray for my son Nathaniel Marston," she wrote. "He was in a car accident last night and is in the intensive care on life support. Back and neck broken in several places. Other internal injuries. Please pray that he will recover and walk again."
See photos of Nathaniel Marston on and off screen:
'One Life to Live' star Nathaniel Marston in critical condition after car accident
Actor Nathaniel Marston arrives to the after party for 'Walk a Mile in my Pradas' at Trousdale on October 14, 2010 in West Hollywood, California. (Photo by Brian Putnam/FilmMagic)
Nathaniel Marston (Photo by Bennett Raglin/WireImage)
403941 05: Actor Nathaniel Marston attends ABC Super Soap Weekends At Disneys California Adventure April 14, 2002 in Anaheim, CA. (Photo by David Klein/Getty Images)
NEW YORK - DECEMBER 18: (L - R) Actors Dick Latessa, Susan Lucci, Kathy Brier and Nathaniel Marston attend a party for ABC Daytime stars to celebrate actress Kathy Brier's new lead role in the Broadway musical 'Hairspray' at Ruth's Chris Steakhouse December 18, 2003 in New York City. (Photo by Evan Agostini/Getty Images)
LOS ANGELES, CA - OCTOBER 23: Actor Nathaniel Marston attends Animal Planet & Sea Shepherd Conservation Society event on October 23, 2010 in Los Angeles, California. (Photo by Mark Sullivan/WireImage)
Actor Tom Archdeacon, Director Joey Sylvester and Actor Nathaniel Marston arrive to the after party for 'Walk a Mile in My Pradas at Trousdale on October 14, 2010 in West Hollywood, California. (Photo by Brian Putnam/FilmMagic)
When the body of a dockworker turned bar owner is found floating in the East River, Castle and Beckett's investigation takes them into the forgotten tunnels and passageways of turn-of-the-century New York, where they uncover a secret that's been buried since the days of Prohibition. The story celebrates New York bar culture, setting Castle on a quest to preserve history by buying a bar of his very own, on 'Castle,' MONDAY, DECEMBER 6 (10:01-11:00 p.m. ET). (Photo by Karen Neal/ABC via Getty Images)
Patricia Mauceri, Kathy Brier, Nathaniel Marston and Ilene Kristen and Renee Goldsberry (Photo by Robin Platzer/FilmMagic)
NEW YORK - DECEMBER 18: Actress Kathy Brier and actor Nathaniel Marston attend a party for ABC Daytime stars to celebrate Kathy Brier's new lead role in the Broadway musical 'Hairspray' at Ruth's Chris Steakhouse December 18, 2003 in New York City. (Photo by Evan Agostini/Getty Images)
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Jackson continued to provide updates throughout the weekend. On Sunday, she wrote that his prognosis looked bleak.
"If he lives he will be paralyzed from the neck down and will not breathe without a ventilator machine," she wrote.
She also later added that his shoulder is broken, along with all of his ribs, and that Marston has a collapsed lung.
Jackson has maintained that the 40-year-old soap star was not under the influence of drugs or alcohol at the time of the crash.
Marston is perhaps best known for his six-year stint on "One Life to Live," which he left after 2007. The actor also played Eddie Silva on "As the World Turns" and guest starred on "Castle," "White Collar" and "Blue Bloods."