Christina Grimmie's Ex-BF's Car Vandalized, Caught on Surveillance Vi

Musician Stephen Rezza -- who was dating Christina Grimmie when "The Voice" star was shot and killed in 2016 -- had his car smashed up ... and it looks like it was all captured on surveillance video. We're told Rezza was inside a music studio he rents in L.A. when his car was vandalized in

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Musician Stephen Rezza -- who was dating Christina Grimmie when "The Voice" star was shot and killed in 2016 -- had his car smashed up ... and it looks like it was all captured on surveillance video.

We're told Rezza was inside a music studio he rents in L.A. when his car was vandalized in the parking lot outside the building.

Stephen rezza damage TMZ.com

As you see ... the vehicle's windshield got smashed, and video footage -- obtained by TMZ -- appears to show someone using a large rock to do damage to the car 3 separate times.

Law enforcement sources confirm a vandalism report was taken and they're investigating. Rezza told cops he believes it was his ex-girlfriend who damaged his car.

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Rezza's had a rough go lately -- he recently had a brain tumor removed, but has been suffering from seizures, saying his health is at an all-time low.

He was Grimmie's boyfriend when she was murdered in 2016 at an Orlando concert by a man who was an obsessed fan. The man killed himself after fatally shooting her.

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Stephen paid tribute to Christina last year by releasing a single featuring her vocals.

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