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(CNN) — Vanessa Marquez, an actress best known for her recurring role as a nurse on the NBC drama “ER,” was shot and killed by police in South Pasadena, California on Thursday, according to the Los Angeles County Sheriff’s Department.

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Police were called to the 1100 Block of Fremont Avenue in South Pasadena just before 2 p.m. local time on Thursday to perform a welfare check. Upon arrival, Marquez, 49, was having seizures and appeared to be suffering from mental issues, officials told CNN.

After about 90-minutes of trying to offer Marquez medical help, police said she armed herself with what appeared to be a handgun and police opened fire.

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The weapon turned out to be a BB gun, investigators said.

Vanessa Marquez as Nurse Wendy Goldman on “ER.” (Photo Source: Alice S. Hall/NBC via Getty)

Marquez played nurse Wendy Goldman on “ER” for three seasons, from 1994-97. Though her character never had major storylines, she was sometimes involved in episode subplots, some of which had a light-hearted bent.

Marquez’s other credits included 1988’s “Stand and Deliver” and “Seinfeld.”

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