In this case, what was thought to be a case of religious fanaticism gone wrong might have actually just been a crime of passion. Hear about the brutal murder of Brenda Lafferty and her infant daughter on this episode of Small Town Mysteries. This case inspired the recent series: Under the Banner of Heaven.
Sources:
1) https://en.wikipedia.org/wiki/The_Church_of_Jesus_Christ_of_Latter-day_Saints#:~:text=The%20Church%20of%20Jesus%20Christ%20of%20Latter%2Dday%20Saints%2C%20informally,the%20Latter%20Day%20Saint%20movement.
2) https://www.deseret.com/utah/2022/4/29/23043175/under-the-banner-of-heaven-series-hulu-lafferty-brothers-ron-dan-murders-what-happened-timeline
3) https://www.aetv.com/real-crime/lafferty-murders
4) https://www.newsweek.com/what-happened-ron-dan-lafferty-where-are-they-now-under-banner-heaven-fx-hulu-1705909
5) https://en.wikipedia.org/wiki/Under_the_Banner_of_Heaven_(miniseries)
6) https://www.deseret.com/utah/2022/5/11/23064288/under-banner-of-heaven-brenda-ron-dan-lafferty-murder-lds-church-real-fiction-sharon-weeks-sister