May 12, 2026

The Peacemaker: Jesse Alvarez and the Murder of Mario Fierro

The Peacemaker: Jesse Alvarez and the Murder of Mario FierroOn February 1, 2021, Mario Fierro, a 37-year-old social studies teacher and football coach at Cathedral Catholic High School in San Diego, California, was shot and killed outside his home by Jesse Milton Alvarez, the ex-boyfriend of Fierro's fiancée, fellow teacher Amy Gembara. Alvarez had been systematically stalking Gembara for over a year before the homicide, and despite Gembara filing a domestic violence restraining order application in January 2020, a San Diego Superior Court judge denied her petition, citing insufficient evidence of abuse under the legal definitions in place at the time.What makes this case so hard to sit with is the documented trail of warnings that couldn't clear a legal bar. A school's social media post celebrating a teacher's engagement became the starting point for a premeditated murder. A judge called the evidence a tie. A stalker called his internet searches therapeutic. And a man who spent every day of his professional life as a peacemaker walked out his front door one February morning and never made it to school. This episode covers the obsession, the institutional failures, and why the murder of Mario Fierro changed how California thinks about what abuse actually looks like.🔔 Subscribe for True Crime Cases multiple times a weekNever miss a story. Subscribe to 10 Minute Murder for bite-sized true crime episodes delivered fresh every week.Get a weekly email from me about the upcoming cases and more: 10minutemurder.com/newsletter📱 Follow for Behind-the-Scenes Content Get exclusive case updates, research photos, and sneak peeks of upcoming episodes:Instagram: @10minutemurder on IGFacebook: 10 Minute Murder on FBTikTok: 10 Minute Murder on TikTok💬 Have a Case Suggestion? Know a fascinating case that deserves coverage? I love listener suggestions and feature the best ones in upcoming episodes. Email: joe@10minutemurder.com Website: 10minutemurder.com ⭐ Help Grow the True Crime CommunityRate & Review: Leave a 5-star review to help other true crime fans discover the showShare: Send this episode to fellow true crime enthusiastsJoin the Discussion: Tag us in your episode reactions on social media🎧 Want Even More True Crime? Check out True Crime Blueprint, also created and hosted by Joe.Spotify: https://open.spotify.com/show/43zuDpH01HtdIrH0ShCAid?si=86b2281063334139

Apple Podcasts: https://podcasts.apple.com/us/podcast/true-crime-blueprint/id1877878404
iHeartRadio: https://iheart.com/podcast/323307878Amazon Music/Audible: https://music.amazon.com/podcasts/b7d5eaae-9d27-40f9-8efb-6864c2af8055Deezer: https://www.deezer.com/show/1002664071Podcast Addict: https://podcastaddict.com/podcast/true-crime-blueprint/6785639Podchaser: https://www.podchaser.com/podcasts/true-crime-blueprint-6381660Spreaker: https://www.spreaker.com/podcast/true-crime-blueprint--6879387Stitcher: https://www.stitcher.com/show/1113943Pandora: https://www.pandora.com/podcast/true-crime-blueprint/PC:1001113943Become a supporter of this podcast: https://www.spreaker.com/podcast/10-minute-murder-bingeable-true-crime-stories--4603604/support.

Also available on Apple Podcasts ↗