“My beautiful sister, Wendy,” Lacey Chabert, 39, wrote in the caption that showed her sister in a graduation photo. “Our hearts are shattered into a million pieces that I don’t know how we will ever put back together again now that you’re gone.
“We love and adore you more than we can ever say and we will continue to forever and ever and ever. The shocking loss has left us so broken-hearted.”
Lacey Chabert also posted the tribute to her sister in a Facebook post.
No details have been released surrounding the death of Wendy Chabert, who was born in October 1975, according to online birth records.
Chabert, 39, has been a staple in Hallmark movies, with her latest movie, “Christmas at Castle Hart,” premiering this month.
Hallmark’s official account added sympathies in the photo’s comments, writing, “We are so deeply sorry for your loss. Sending our love and strength to you and your family during this time.”
According to a 1992 article in the Clarion-Ledger of Jackson, Mississippi, Wendy Chabert attended New York’s Junior High and High School for the Performing Arts, along with another sister, Crissy Chabert.
Fellow Hallmark Channel star Candace Cameron Bure, also responded to Lacey Chabert’s post to offer condolences.
‘We are praying for you, your family and Wendy’s family,” Bure wrote. “Always here for you my sweet sweet friend.”
“Oh my goodness, Lacey. I love you so much and am sending prayers and love to you,” former “Wonder Years” star Danica McKellar wrote. “I don’t know what I could possibly do but please call on me if I can do anything at all.”
Lacey Chabert honored both of her sisters with an Instagram post on National Sisters Day in August, showing the trio in front of a Christmas tree.
“Couldn’t let #nationalsistersday pass without saying how much I love my two sisters,” she wrote in her caption. “They are the best big sisters ever and I thank God for them every day. Love you, Wendy and Crissy.”
Photos: Lacey Chabert through the years Here are some memorable photos of actress Lacey Chabert through the years. (Rich Polk/Getty Images for IMDb)
Photos: Lacey Chabert through the years 1998: Lacey Chabert stars in "Party of Five." (Getty Images)
Photos: Lacey Chabert through the years 1999: Actress Lacey Chabert attends the first annual Costume Designers Guild Awards on February 6, 1999, at Beverly Hilton Hotel at Beverly Hills, California. (Ron Galella, Ltd./Ron Galella Collection via Getty Images)
Photos: Lacey Chabert through the years 2000: Lacey Chabert arrives at the series finale wrap party for "Party of Five," April 6, 2000, at the Sunset Room in Hollywood, California. (Chris Weeks/Getty Images)
Photos: Lacey Chabert through the years 2001: Actress Lacey Chabert arrives at the grand opening of One Seven, a teen dance club and store at Hollywood and Highland, on November 30, 2001, in Hollywood, California. (Jason Kirk/Getty Images)
Photos: Lacey Chabert through the years 2002: Actress Lacey Chabert (left) attends the film premiere of "The Wild Thornberrys" at the Cinerama Dome on December 8, 2002, in Hollywood, California. (Frederick M. Brown/Getty Images)
Photos: Lacey Chabert through the years 2003: Actress Lacey Chabert attends the Los Angeles film premiere of "Legally Blonde 2" at the Mann National Theatre on July 1, 2003, in Westwood, California. (Frederick M. Brown/Getty Images)
Photos: Lacey Chabert through the years 2004: Actress Lacey Chabert attends a private screening of "Mean Girls" on April 23, 2004, at Loews Lincoln Square Theater in New York City. (Paul Hawthorne/Getty Images)
Photos: Lacey Chabert through the years 2005: Actresses Rachel McAdams, Lacey Chabert, Amanda Seyfried and Lindsay Lohan accept their award for Best Team onstage during the 2005 MTV Movie Awards at the Shrine Auditorium on June 4, 2005, in Los Angeles. (Kevin Winter/Getty Images)
Photos: Lacey Chabert through the years 2006: Actress Lacey Chabert attends "A Time for Heroes Celebrity Carnival" sponsored by Disney to benefit the Elizabeth Glaser Pediatric AIDS Foundation on the grounds of the Wadsworth Theater on June 11, 2006, in Brentwood, California. (David Livingston/Getty Images)
Photos: Lacey Chabert through the years 2007: Actor Lacey Chabert poses at the Step up Women's Network's fourth annual Inspirational Awards held at the Beverly Wilshire Regency Hotel on April 20, 2007, in Beverly Hills, California. (Frazer Harrison/Getty Images)
Photos: Lacey Chabert through the years 2008: Actress Lacey Chabert attends the Alberta Ferretti US flagship store opening at Alberta Ferretti on November 12, 2008, in Los Angeles. (John Shearer/Getty Images)
Photos: Lacey Chabert through the years 2009: Actors Matthew McConaughey, Lacey Chabert, director Mark Waters and actress Emma Stone pose at the afterparty for the premiere of Warner Bros. "Ghosts of Girlfriends Past" at Beso on April 27, 2009, in Los Angeles. (Kevin Winter/Getty Images)
Photos: Lacey Chabert through the years 2010: Actress Lacey Chabert attends the "In My Sleep" film premiere at the Arclight Hollywood on April 15, 2010, in Los Angeles. (Frederick M. Brown/Getty Images)
Photos: Lacey Chabert through the years 2011: Actress Lacey Chabert arrives at the Step up Women's Network's eighth annual Inspiration Awards at the Beverly Hilton Hotel on June 10, 2011, in Beverly Hills, California. (Frazer Harrison/Getty Images)
Photos: Lacey Chabert through the years 2012: Actors Amy Davidson and Lacey Chabert attend 7 for All Mankind and Step up Women's Network Celebrate "A Stepped up Affair" at Cecconi's Restaurant on October 24, 2012, in Los Angeles. (John Sciulli/Getty Images for InStyle)
Photos: Lacey Chabert through the years 2013: Lacey Chabert attends the Best Buddies Poker Event at Audi Beverly Hills on August 22, 2013, in Beverly Hills, California. (Jason Kempin/Getty Images)
Photos: Lacey Chabert through the years 2014: Actress Lacey Chabert attends Hallmark Channel & Hallmark Movie Channel's 2014 Winter TCA Party at The Huntington Library and Gardens on January 11, 2014, in San Marino, California. (Frederick M. Brown/Getty Images)
Photos: Lacey Chabert through the years 2015: Actress Lacey Chabert attends the AMC celebration of the final seven episodes of "Mad Men" with the Black & Red Ball at the Dorothy Chandler Pavilion on March 25, 2015, in Los Angeles. (Alberto E. Rodriguez/Getty Images)
Photos: Lacey Chabert through the years 2016: Lacey Chabert attends the Milk + Bookies' seventh annual Story Time Celebration on April 17, 2016, in Los Angeles. (Araya Diaz/Getty Images Milk + Bookies)
Photos: Lacey Chabert through the years 2017: Actress Lacey Chabert (right), her daughter, Julia Mimi Bella Nehdar, and Mickey Mouse attend Disney on Ice: Follow Your Heart at Staples Center on December 16, 2017, in Los Angeles. (Andrew D. Bernstein/Getty Images for Feld Entertainment)
Photos: Lacey Chabert through the years 2018: Actress Lacey Chabert attends the James Paw 007 Ties & Tails Gala at the Four Seasons Westlake Village on March 10, 2018, in Westlake Village, California. (Christopher Polk/Getty Images for Paw Works Inc.)
Photos: Lacey Chabert through the years 2019: Candace Cameron-Bure, Lacey Chabert, Kristin Chenoweth and Michelle Vicary arrive at the Los Angeles special screening of Hallmark Channel's "A Christmas Love Story" at Montage Beverly Hills on October 21, 2019, in Beverly Hills, California. (Morgan Lieberman/Getty Images)
Photos: Lacey Chabert through the years 2021: Lacey Chabert appears on a 2021 episode of "Celebrity Wheel of Fortune." (Eric McCandless/ABC via Getty Images)