In 1992 Marquez appeared in the Seinfeld fourth season episode "The Cheever Letters",[3] portraying a secretary in the Cuban Permanent Mission (the US and Cuba did not have mutual embassies from 1961 to 2015).

[5] Prior to her death, Marquez made headlines related to the #MeToo movement, alleging that she endured harassment while on the set of ER.

[6] Marquez appeared in an early episode of the A&E Network reality television series Intervention, as she tried to manage her shopping addiction.

[10] Her home was found in a state of disarray and she claimed to be experiencing a seizure, for which paramedics and a mental health expert were called to evaluate her.

[4][13] In March 2020, the South Pasadena Police Department released bodycam footage from the incident, showing Marquez pleading to the officers to kill her, as well as pointing the replica gun at them.