A man was fatally stabbed in the chest at the Santa Ana venue Underground DTSA on Thursday night. The altercation occurred during the second act of a five band bill headlined by LA garage-rockers Feels, OC Weekly reports, part of the club’s weekly Top Acid Thursdays concert series. According to Feels frontwoman Laena Geronimo, the fight broke out when the victim, later identified as Nathan Joe Alfaro, 23, attempted to restrain another man who was moshing violently and aggressively during the show. “Not moshing in a punk way,” Geronimo says. “More like ‘this is my excuse to fuck people up’ kinda style…It’s not like it had anything to do with the show, he just seemed like a guy who left his house wanting to hurt someone.” After the stabbing, the suspect fled while the event was shut down and the victim was transported to a nearby hospital in critical condition, where he later died of his injuries. Feels describe the tragic incident in a lengthy post on their official Facebook page:

We are completely devastated, so totally at a loss for words but feeling the need to say some things in honor of the spirit of the kid who apparently got stabbed to death at the show last night… Punk isn’t about hurting other people. Fuck that shit.

Thank you to the Nathan who gave up his life last night to try to keep the one totally psycho violent moshing guy in check. The psycho dude had crazy eyes and was slamming into everyone in the room, even on the edges, almost knocked over the entire DJ set up… but who could’ve known he had a knife. We watched as the fight broke out, crashing onto the stage knocking mics over while the second band played, saw fists flying and more and more people dog piling on to try to break it up but still had no idea… then there was blood on the floor, cops and paramedics, the whole show was shut down of course, but still when we left we were under the impression that he was stabbed in the shoulder and was going to be fine.

Waking up this morning and finding out that he died in the hospital… There are no words. We are sending all of our love to the spirit of Nathan, his friends and family. We seriously hope that the murderer is captured and prosecuted to the fullest.

Let’s all take something forward from this… If you’re at a show and you clock someone sketchy who’s just out to hurt other people — just driven by violence and not music — head straight for the bouncer. Don’t get us wrong, we love mosh pits. Slamming into other people can be the most fun liberating thing in the world, and yeah sometimes people get hurt — but it should NEVER be intentional. If someone falls you pick them up — there’s an unspoken camaraderie in the pit. Fuck anyone who acts otherwise. Fuck this insane violence. We are sick with the understanding that this happened before our eyes.

Santa Ana police have since arrested 21-year-old Juan Angel Rivera in connection with the murder.