Seven people, including two teenagers, were found dead on a property in Henryetta, Oklahoma, on Monday. Among the victims are Holly Guess and her three children, as well as aspiring teacher Rylee Elizabeth Allen and "amazing angel" Brittany Brewer, who were last seen with deceased registered sex offender Jesse McFadden. Holly Guess was married to McFadden, who failed to show in court on Monday for child pornography and solicitation of a minor charges. Authorities believe McFadden murdered the six people before ending his own life. McFadden had a history of rape and was convicted in 2003, serving nearly 17 years in prison. The parents of Ivy Webster, another victim, are warning parents of the dangers and the need to keep convicted sex offenders in jail. McFadden’s past was unknown to Ivy's parents, who allowed her to stay at the same property the night she went missing. The Okmulgee County authorities have not yet released information on how the victims died and who killed them.