My ex-FiL was the lead homicide detectives on that case. After he retired he went into ministry work. He told me when they had initially apprehended Ottis they were trying to get him to reveal the whereabouts of Adam's remains but to no avail. The captain came to my ex-FiL and said Ottis wanted someone to pray with and it was then that Ottis made his initial confessions. Although these confessions were clouded with lies it seems pretty obvious they held enough truth.
My ex-FiL has an astounding memory. One Saturday we were sitting around when i told him 2 very official looking gentleman came up the front walk. They were former colleagues asking about a mob murder. The lead suspect had been found in a rock pit in New York 6 months prior and they wanted to know what he recalled of the original murder.
Apparently, the original victim had entered his business from the rear door early in the morning about 6am. The killer had been lying in wait and delivered a single blast to the chest from a shotgun. There had been a large amount of blood splatter consistent with a point-blank shotgun injury. Furthermore, questioning of friends and family seemed to rule out anyone with a personal motive and no valuables were taken. Because of the lying in wait, the choice of shotgun (no ballistics) and absence of an acquaintance as a suspect my ex-FiL assumed it had been a contract killing more than likely a mob hit.
As soon as he said "mob hit" the other 2 started nodding their heads. Although the murder was more than 6 years old at that time the lead suspect had made himself known to several organized crime units between south Florida and New York.
It seems he had been laid off for poor job performance.