Robin Trocki (June 30, 1956 – December 14, 2019) was an actress who portrayed Jean Sylvester, Sue's older sister, on Glee. Like her character, Trocki had Down syndrome.
Trocki was a native of New Jersey and lives in Los Angeles. In addition to her work on Glee, she worked in a bakery, took karate lessons, and was a published writer. Her writing and art was published in the book Disabled Fables: Aesop's Fables, Retold And Illustrated By Artists With Developmental Disabilities.
In 2009, the Down Syndrome Association of Los Angeles honored her with her its "Voices" award.</p>
In 2010, she and fellow Glee actress Lauren Potter received The Arc's Inclusion & Image Award for "breaking down barriers, increasing awareness and challenging stereotypes".
Trocki died on December 14, 2019 at the age of 63 following complications from Alzheimer's.
Trocki appeared as a recurring character Jean Sylvester in five episodes of Glee during seasons 1 and 2. She was written off Glee after she developed advanced Alzheimer's during Season Two. 
Sue's baby, Robin Sylvester, is named after her.
Because of her Alzheimer's she was expected to forget her role on Glee. However, Jane Lynch and Lauren Potter took Jordyn (or baby Robin) to see Robin, to which she replied, 'I'm your aunt'.