Christy Knowings, the Bronx-born actress and comedian best known for her memorable work on Nickelodeon’s beloved sketch-comedy series All That, died at the age of 46. Her death on August 11, 2026, initially left fans and former colleagues mourning without a confirmed official cause. That information has now been revealed through her death certificate.

According to the death certificate obtained by PEOPLE, Knowings died from cardiac arrest. The document lists acute hypoxic respiratory failure and status asthmaticus as conditions leading to her death, while asthma was identified as the underlying cause. Knowings had suffered a severe asthma attack several days before her death and was hospitalized in Los Angeles.

Family members previously told TMZ that Knowings experienced the asthma attack on August 7 and subsequently suffered brain damage. She was placed on life support, remaining hospitalized for several days before her family ultimately made the difficult decision to withdraw life support. She died four days after the medical emergency.

News of her passing has brought an outpouring of memories from people who grew up watching her on All That. Knowings joined the Nickelodeon sketch series as a teenager in 1997 and remained with the program for three seasons, becoming part of a cast that included Kenan Thompson, Amanda Bynes, Kel Mitchell, Nick Cannon, and other performers who would go on to successful entertainment careers.

During her time on All That, Knowings demonstrated her ability to transform into a wide variety of characters. Among the roles she became known for were Jessica and Penny Lane, while one of her most recognizable recurring appearances came through the “Whateverrr!” sketch alongside Amanda Bynes.

Knowings later revealed that one of her favorite characters was Gloria Bankhead, an exaggerated lifestyle personality she portrayed during the show’s sixth season. Her performances were characterized by energetic comedy, distinctive personalities, accents, and a willingness to fully commit to the characters she created.

Born Christy Lorraine Knowings on February 25, 1980, in the Bronx, she developed her performance abilities from an early age. She attended Manhattan’s Professional Performing Arts School and had already been performing characters and impressions before her breakthrough on Nickelodeon.

Beyond All That, Knowings continued working in entertainment. She appeared on Sesame Street alongside her twin brother, Chris Knowings, in several episodes between 2008 and 2011. She also remained involved in comedy and music, including releasing the folk song “To the World” in 2020.

Her work also carried personal significance because of the diversity she brought to children’s television. Knowings spoke openly about being from the Bronx and identifying as Native American Afro-Latina, explaining that her background allowed her to contribute cultural experiences and perspectives to All That.

Following her death, former co-star Kenan Thompson publicly paid tribute to Knowings, remembering her as exceptionally funny and expressing love for her family. Other colleagues and members of the entertainment community have also remembered her creativity, warmth, and dedication to performing.

Her manager, Al Hill, described Knowings as a multi-talented performer who was always creating and remained professional and dedicated to her work. A fundraising campaign established on behalf of her parents also remembered her as a compassionate person whose warmth, kindness, and humor affected those around her.

Christy Knowings’ death marks the loss of a performer whose work became part of the childhood memories of countless viewers. From her years on All That to her later appearances and creative projects, she left behind a body of work that continues to connect her with audiences who remember the distinctive characters and comedy she brought to television.

Her passing at just 46 has left family, friends, former castmates, and fans reflecting on a career that began when she was young and continued across multiple forms of entertainment. The newly confirmed cause of death provides additional clarity surrounding the tragic circumstances of her final days while underscoring the devastating impact of the severe asthma attack she experienced.