Due to his odd behavior, he was temporarily interned at the John Peter Smith Hospital, where he remained for ten days.

[3] At the time, he was dating Everlene Gould, the oldest of three sisters belonging to the McClendon family, who would later claim that he was occasionally violent towards her in arguments.

[4] On October 8, 1974, Granviel was driving around the Riverside Village apartment complex when he got the sudden urge to have sex with one of the McClendon sisters, 21-year-old Laura.

[5] Next came Linda, whom he strangled to death with a piece of cloth before moving onto Steven, who was shoved into a closet and stabbed so many times that the knife's handle broke.

"[9] On February 8, 1975, feeling the urge to kill again, Granviel lured a friend of his, 24-year-old Betty Williams, into his apartment on the pretence of giving her a package of cigarettes.

[5] Once he was let inside, he raped his friend's mother and kept the other family members under watch, before finally kidnapping one of the daughters and fleeing back to his apartment.

[5] Out of an apparent feeling of guilt, Granviel forced his rape victim into the car, where they drove to the local Pilgrim's Galilee Baptist Church and picked up the presiding pastor, Rev.

[5] In there, Granviel took out a pistol and a butcher knife, placed them on the table and asked for Lt. Oliver Ball, the lead detective investigating the Riverside Village murders.

[5] Ball, along with district attorney Rufus Adcock, were called into the office, and in front of all three of them, Granviel readily confessed to all seven murders.

[10] While he was ruled out in several, he was considered a credible suspect in two: the 1967 murder of 18-year-old Mildred May, whose nude and battered body was found along the I-35W near Fort Worth, since he had already been questioned in the death at the time.

[4] Just days after the trial, Justice Tom Cave allowed the prosecutors to admit Granviel's four-page long confession as evidence, over the objections of his attorneys.

[9] Granviel himself, who had pleaded not guilty by reason of insanity, said before the jury that while he acknowledged he was solely responsible for the killings, he was unable to control himself in the moment.