A San Diego man is accused of stalking his ex-girlfriend for more than a year after a judge rejected her request for a restraining order and then killing his exs fianc.

Prosecutors say Jesse Milton Alvarez was spurred by jealousy when he carefully planned the fatal shooting of Mario Fierro, a beloved teacher.

When Fierro proposed to Amy Gembara, a fellow teacher at Cathedral Catholic High School, in December 2020, he couldnt know that her jealous, obsessive and possessive ex-boyfriend would methodically plot his execution, prosecutors recently said in opening statements for Alvarezs murder trial.

Fierro did know that Alvarez, now 33, had allegedly been stalking Gembara since their breakup in September 2019, after three years of dating. School security officials had escorted Alvarez off campus several times, but he and Fierro had never met face to face until the morning of Feb. 1, 2021, when Alvarez shot him six times in front of his home as Fierro, 37, was preparing to leave for work.