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Kevin Mares -- a Bad Bunny fan who traveled down to Puerto Rico to see the artist -- has been shot and killed.

We spoke with Kevin's mother, Sandra , through a friend acting as a translator ... and, she confirmed to us her son was shot early this morning at a pool party in La Perla, PR. Gallery Launch Gallery

Sandra tells us her son was a massive Bad Bunny fan ... and, he planned this trip with his girlfriend and their friends about a year ago -- with the group eager to watch the show on Sunday. They are no longer attending the show in light of the shooting. Play video content

Kevin sent a video from the pool party and what looks like the view from his hotel room to Sandra ... and, it looks like he was enjoying himself in the country.

According to report

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