. >> reporter: one of six siblings, all raised in hesperia, california, another desert town 25 milesstian household where the emphasis was on helping those in need. >> our faith was always -- not really a supplement to our life, but it was the foundation of our life. >> reporter: jonathan was homeschooled and later went off to the fire academy. when jason met him he was in training, but soon after jonathan became a full-fledged firefighter. one of his responsibilities was to buy food and supplies for the fire station. which made him a frequent customer at costco. the same costco where sabrina limon worked, passing out free samples. >> sabrina told us, like, "hey, i met one of the guys you used to work with." >> and i'm like, "oh, that's gotta be jonathan hearn. smartest guy." one of the smartest guys i've ever met. >> reporter: that was 2012. early the following year jason and kelly ran into jonathan at a wolfpack party. >> and i was like, "oh, you know sabrina." so, i called at her from across the bar, and i said, "hey, brina. jonathan's here." and -- now, sabrina's normally like a