SALT LAKE CITY (AP) — Thirty years ago, Dan Lafferty and his brother grew their hair long, called themselves prophets and claimed God told them to kill their sister-in-law and her baby after she resisted her husband's entry into a radical polygamous group. The mindset of Strack and her husband, Benjamin, grew increasingly bizarre, culminating with a belief that the apocalypse was near just before they killed themselves with a drug overdose and took their three children with them. The Stracks' close, frequent communication with Lafferty didn't raise any concerns by Utah prison officials, and there generally isn't any reason it would, said spokeswoman Brooke Adams. Court records show the couple pleaded guilty to misdemeanor forgery charges in 2008 and disorderly conduct in 2009, part of a minor criminal history that spanned about 12 years. The couple also had gone through court-ordered drug treatment, but Elizabeth Sollis, a spokeswoman for Utah child welfare services, said Wednesday that's not necessarily a reason for state workers to intervene in a family. Kristi Strack, 36, was being prescribed methadone for opiate addiction at the time of her death, and that's how investigators believe she got the methadone used in the overdose deaths.