Jerry Stiller, 91, under observation in New York City hospital: Details

Jerry Stiller, 91, is under observation at a New York City hospital after suffering stroke-like symptoms, but not an actual stroke, on Wednesday.

Although an insider told Radar that Stiller's condition is "serious," a family friend clarified to Page Six that there is "no evidence" he had a stroke: “He had some sort of episode and they wanted to be cautious."

Stiller has made few public appearances since the 2015 death of his wife, Anne Meara, whom he wed in 1954. The two worked as a husband-wife comedy team throughout the '60s and '70s. Later in life, Stiller would star on "Seinfeld" as Frank Constanza and then on "King of Queens" for nearly a decade.

Ben Stiller has not yet made any public comments about his father's condition.

See photos of Jerry Stiller through the years:

35 PHOTOS
Jerry Stiller through the years
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Jerry Stiller through the years
NEW YORK - SEPTEMBER 6: CBS television religious and public affairs program, Lamp Unto My Feet. Episode titled, The Cape. A two part drama about parents coping with a mentally challenged child. The family pediatrician recommends the child to be institutionalized. From left is Jerry Stiller and William Shatner. The program shown over two dates, September 9 and 16, 1962. Image dated September 6, 1962. New York, NY. (Photo by CBS via Getty Images)
NEW YORK - NOVEMBER 7: Anne Meara and Jerry Stiller are photographed for THE ED SULLIVAN SHOW. Image dated November 7, 1966. (Photo by CBS via Getty Images)
NEW YORK - APRIL 28: THE ED SULLIVAN SHOW Jerry Stiller & Anne Meara perform. Image dated April 28, 1968. (Photo by CBS via Getty Images)
KRAFT MUSIC HALL -- 'Love & Marriage, Part 1 & 2' Episode 1311 & 1312 -- Pictured: (l-r) Husband and wife comedy team: Anne Meara, Jerry Stiller -- (Photo by: NBC/NBCU Photo Bank via Getty Images)
KRAFT MUSIC HALL -- 'Love & Marriage, Part 1 & 2' Episode 1311 & 1312 -- Pictured: (l-r) Husband and wife comedy team: Anne Meara, Jerry Stiller -- (Photo by: NBC/NBCU Photo Bank via Getty Images)
UNITED STATES - NOVEMBER 17: THE COURTSHIP OF EDDIE'S FATHER - 'Thy Neighbor Loves Thee' - Season Three - 11/17/71, Jerry Stiller (as Paul) on the ABC Television Network comedy 'The Courtship of Eddie's Father'. Widower Tom Corbett must raise his son Eddie who is always scheming to get his dad remarried., (Photo by ABC Photo Archives/ABC via Getty Images)
LOVE AMERICAN STYLE - 'Love and the Clinical Problem' - Airdate November 9, 1973. (Photo by ABC Photo Archives/ABC via Getty Images) JERRY STILLER;ANNE MEARA
Jerry Stiller during Jerry Stiller Backstage After Performing in 'The Ritz' - January 1, 1975 at The Longacre Theater in New York City, New York, United States. (Photo by Ron Galella/WireImage)
6th June 1976: Married American actors Jerry Stiller and Ann Meara sit with their children, Ben (left) and Amy Stiller, at the UJA telethon. (Photo by Tim Boxer/Hulton Archive/Getty Images)
NEW YORK CITY - JUNE 4: Jerry Stiller and Ben Stiller attend the performance of 'The Gin Game' on June 4, 1978 at the Martin Beck Theater in New York City. (Photo by Ron Galella, Ltd./WireImage)
Jerry Stiller walks in a scene from the United Artist movie 'Those Lips, Those Eyes', circa 1980. (Photo by Michael Ochs Archives/Getty Images)
Jerry Stiller in New York City. November 1, 1979 (Photo by Walter McBride/Corbis via Getty Images)
UNITED STATES - OCTOBER 01: Married actors Jerry Stiller and Anne Meara. (Photo by The LIFE Picture Collection/Getty Images)
Sylvia Miles and Jerry Stiller at Esai Morales' birthday party at Visage. Tuesday, October 1, 1985. (Photo by Patrick McMullan/Getty Images)
LOS ANGELES, CA - SEPTEMBER 13: Anne Meara and Jerry Stiller attend the party for 33rd Annual Primetime Emmy Awards on September 13, 1981 at the Bonaventure Hotel in Los Angeles, California. (Photo by Ron Galella, Ltd./WireImage)
Actor Jerry Stiller and his daughter Amy. (Photo by Time Life Pictures/DMI/The LIFE Picture Collection/Getty Images)
Jerry Stiller And Alec Baldwin during Political Rally For David Dinkins - September 9, 1989 in New York City, New York, United States. (Photo by Ron Galella/WireImage)
Jerry Stiller and Anne Meara attends a party at Gracie Mansion, June 1, 1993 in New York City. (Photo by Walter McBride/Corbis via Getty Images)
Ben Stiller with his parents Jerry Stiller and Anne Meara Attending the opening night performance of THREE SISTERS at the Roundabout Theatre in New York City. May 21, 1998 (Photo by Walter McBride/Corbis via Getty Images)
NEW YORK CITY - DECEMBER 8: Ben Stiller and Jerry Stiller attend the performance party for 'What's Wrong With This Picture' on December 8, 1994 at Dish of Salt Restaurant in New York City. (Photo by Ron Galella, Ltd./WireImage)
Unspecified - 1994: (L-R) Jerry Stiller, Kelly Ripa appearing on ABC's 'All My Children'. (Photo by ABC via Getty Images)
UNITED STATES - From left to right, Ben Stiller, Jeanne Tripplehorn and Jerry Stiller at a screening of 'Reality Bites', 1994. (Photo by The LIFE Picture Collection/Getty Images)
Anne Meara & Jerry Stiller attend the MTC Spring Gala at the Hilton Hotelon 5/15/1995 in New York City. (Photo by Walter McBride/Corbis via Getty Images)
UNITED STATES - NOVEMBER 01: Jerry Stiller, Anne Meara (Photo by The LIFE Picture Collection/Getty Images)
UNITED STATES - OCTOBER 01: Ben Stiller has a hug for his dad, Jerry Stiller, at Friars Club Roast for Jerry at the Hilton Hotel. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
Jerry Stiller arriving at the Project A.L.S. 'Tomorrow Is Tonight' gala at Roseland Ballroom in New York City. October 21, 2002. Photo by Evan Agostini/ImageDirect.
LOS ANGELES - SEPTEMBER 24: Jerry Stiller stars in The King of Queens. (Photo by Cliff Lipson/CBS via Getty Images)
Jerry Stiller during The Actors Fund of America's Razzle Dazzle Gala at Cipriani 42nd Street in New York City, New York, United States. (Photo by James Devaney/WireImage)
Jerry Stiller, Julia Louis-Dreyfus and Michael Richards (Photo by Carley Margolis/FilmMagic)
Jerry Stiller, Anne Meara, Ben Stiller and Christine Taylor (Photo by Brian Ach/WireImage for Fox Broadcasting Network)
CULVER CITY, CA - DECEMBER 14: Actor Jerry Stiller performs on stage at Spike TV's 2008 Video Game Awards at Sony Picture Studios on December 14, 2008 in Culver City, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - OCTOBER 27: Actor Jerry Stiller attends the 2011 Project A.L.S. 'Tomorrow Is Tonight' Benefit at Lucky Strike Lanes & Lounge on October 27, 2011 in New York City. (Photo by Michael Stewart/WireImage)
NEW YORK, NY - OCTOBER 11: Jerry Stiller attends NY1 News 20th Anniversary Party at New York Public Library on October 11, 2012 in New York City. (Photo by Shahar Azran/WireImage)
NEW YORK, NY - NOVEMBER 03: Actor Jerry Stiller attends the Charlotte Rae book signing of 'The Facts of My Life' at Sardi's on November 3, 2015 in New York City. (Photo by Bobby Bank/WireImage)
NEW YORK, NY - NOVEMBER 03: Actor Jerry Stiller attends the Charlotte Rae book signing of 'The Facts of My Life' at Sardi's on November 3, 2015 in New York City. (Photo by Bobby Bank/WireImage)
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