A woman whose daughter was killed by MS-13 gang members died Friday night in an incident while attending a vigil for her daughter. 

Evelyn Rodriguez - who was honored by President Trump at the State of the Union address and appeared several times on Fox News Channel - was struck by an SUV in Brentwood, New York. 

Rodriguez was preparing to hold a vigil on the two-year anniversary of the murder of her daughter, 16-year-old Kayla Cuevas. Rodriguez reportedly had an argument with someone about the location of the vigil when the SUV struck her. 

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Suffolk County police said they were investigating, but the driver was not arrested. President Trump offered his condolences on Twitter over the weekend. 

Cuevas and her friend Nisa Mickens, 15, were attacked and killed with machetes and baseball bats in 2016, leadiing Rodriguez to be a leading voice calling for crackdowns on MS-13.

Responding on "Fox & Friends" Monday, Suffolk County District Attorney Timothy Sini said residents are "heartbroken" over Rodriguez's death, calling her "a true partner to law enforcement."

"She became a national figure. She was able to talk about these issues [of MS-13 violence] firsthand and she was very effective," he told Steve Doocy, explaining that Rodriguez turned her daughter's murder into a "positive motivation to effect positive change."

Sini said MS-13 had nothing to do with the incident Friday night. 

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