David's brother, Andy Spade, wed Kate in 1994. The two were reportedly suffering from marital troubles and had been living apart for ten months when Kate died by suicide at age 55 last year.
Kate and Andy shared one child, Frances Beatrix, born in 2005. She's three years older than David's daughter, Harper, who was born in 2008.
Although the extended family lived on opposite coasts, David adored and was close with his sister-in-law. After her death, he donated $100,000 to the National Alliance on Mental Illness.
Kate Spade through the years
Kate Spade through the years
Kate Spade during The 2001 VH1/Vogue Fashion Awards - Arrivals at The Hammerstein Ballroom in New York City, New York, United States. (Photo by Jim Spellman/WireImage)
Kate Spade during The Fresh Air Fund Salutes American Heroes at Tavern on the Green in New York City, New York, United States. (Photo by Jim Spellman/WireImage)
Designer Kate Spade arriving at the 2002 Ace Awards presented by The Accessories Council at Cipriani 42nd Street in New York City. November 5, 2002. Photo by Evan Agostini/ImageDirect.
Kate Spade during The Concert for New York City - After Party at Hudson Hotel in New York City, New York, United States. (Photo by Ron Galella/WireImage)
Kate Spade during 13th Annual Glamour Magazine's Women of the Year Awards - Arrivals at Metropolitan Museum of Art in New York City, New York, United States. (Photo by Dimitrios Kambouris/WireImage)
Kate Spade with husband and brother-in-law David Spade at the 20th Annual American Fashion Awards at Avery Fisher Hall, Lincoln Center in New York City. 06/14/2001. Photo: Evan Agostini/ImageDirect
Kate Spade during 17th Annual CFDA Awards at JP Morgan Atrium in New York City, New York, United States. (Photo by Ron Galella/WireImage)
Designer Kate Spade is photographed at her offices. (Photo by David Howells/Corbis via Getty Images)
Kate Spade and Andy Spade during Costume Institute Benefit Dance: 'Party of the Year' - Arrivals at Metropolitan Museum of Art in New York City, New York, United States. (Photo by Dimitrios Kambouris/WireImage)
Kate Spade during 14th Annual GLAMOUR Women of the Year Awards - Red Carpet at American Museum of Natural History in New York City, New York, United States. (Photo by Dimitrios Kambouris/WireImage)
Kate Spade (Photo by Carley Margolis/FilmMagic)
Kate Spade during CFDA 7th on Sale Kick-Off - Red Carpet and Inside at Sky Light Studios in New York City, New York, United States. (Photo by Rabbani and Solimene Photography/WireImage for LaForce and Stevens)
NEW YORK - JUNE 7: Designer Kate Spade attends the '2004 CFDA Fashion Awards' at the New York Public Library June 7, 2004 in New York City. (Photo by Evan Agostini/Getty Images)
Kate Spade, Andy Spade and Ruth Lande Shuman, founder/president of Publicolor (Photo by Carley Margolis/FilmMagic)
David Spade and Kate Spade during Photographer's Gallery Presents Slim Aarons Curated by Kate Spade at Fred Segal Cafe in West Hollywood, California, United States. (Photo by Chris Weeks/WireImage)
NEW YORK CITY, NY - APRIL 30: Kate Spade and Andy Spade attend PARSONS The NEW SCHOOL FOR DESIGN 59TH ANNUAL BENEFIT and FASHION SHOW Honoring SUSAN D. KRONICK, Vice Chairman, Federated Department Stores, Inc. at Grand Hyatt on April 30, 2007 in New York City. (Photo by JIMI CELESTE/Patrick McMullan via Getty Images)
NEW YORK, NY - NOVEMBER 10: Kate Spade attends the 2015 Basser Center For BRCA Benefit at Cipriani Wall Street on November 10, 2015 in New York City. (Photo by Daniel Zuchnik/WireImage)
NEW YORK, NY - APRIL 28: Kate Spade speaks on stage at Build Series Presents Kate Spade and Andy Spade Discussing Their Latest Project Frances Valentine at Build Studio on April 28, 2017 in New York City. (Photo by Monica Schipper/WireImage)
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"Kate and I during Christmas family photos. We had so much fun that day," he captioned a photo of the two. "She was so sharp and quick on her feet. She could make me laugh so hard. I still cant believe it. It's a rough world out there people, try to hang on."
Kate was also aunt to "The Marvelous Mrs. Maisel" star Rachel Brosnahan, who shared a family video after her passing.
If you or someone you know is having suicidal thoughts, please call the National Suicide Prevention Hotline at (800-273-8255).