"At the time [of the shooting] there was an LA County mental health clinician here with the officers", Mendoza said.
Marquez played Nurse Wendy Goldman on "ER" Marquez made headlines a year ago after accusing the show's star George Clooney of having her blacklisted after she reported suffering sexual and racial harassment on the set of the NBC medical drama.
Police said they had been to the actress' home on many occasions in the past, KABC reported.
Following her stint on ER, Marquez appeared in three episodes of the 1990s sitcom Malcolm & Eddie, and the 2001 TV-movie Fire & Ice. She had a role in the 1988 drama Stand and Deliver.
Deputy Sheriff Armando Viera Jr., public information officer for the Los Angeles County Sheriff's Department, confirmed Friday that the victim was Marquez. Clooney flatly denied the Marquez's claims.
Marquez was reportedly shot "at least once" in the torso, and was later proclaimed dead at the hospital.
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Last October, Marquez alleged that she was blacklisted from "ER" by co-star George Clooney after complaining of racial discrimination and sexual harassment. "I take her at her word", the actor said at the time.
"I had no idea Vanessa was blacklisted", he said in a statement to TheWrap. Marquez tweeted that the blacklisting began when she made complaints to the show's executive producers, John Wells. "The fact that I couldn't affect her career is only surpassed by the fact that I wouldn't". I had nothing to do with casting.
It was noted that Marquez had written on her personal Facebook page about issues with celiac disease and seizures, but there did not seem to be any indication of metal health issues. 'I was an actor and only an actor. Marquez appeared in 27 episodes.
In 2005, Marquez's shopping addiction was covered in an episode of Intervention.
"A person only has so much strength and I'm afraid I've used all mine up", she wrote at the time.