In September 1978, Williams met 26-year-old Robert Leslie Tyson while working on a remodeling job. The two men worked odd jobs and committed several offenses together, including stealing from their employer. Amongst the stolen items was a gun, which Williams kept for himself. On September 30, Williams, accompanied by his ex-wife, and a cousin of hers, Tyson and Tyson's wife, drove to
Modesto. On the way, the car broke down, and the five were stranded. Nearby was a camper, which Williams and Tyson decided to rob. The two of them ordered the couple out of the vehicle at gunpoint, stole the vehicle, and drove off, with Williams firing off several rounds over their heads into the air. They pawned some of the stolen goods but kept several items back for a yard sale organized by Tyson's wife. On October 6, 31-year-old Miguel Vargas, accompanied by his girlfriend, 25-year-old Lourdes Meza, met Williams and Tyson at the yard sale. Williams expressed interest in purchasing Vargas' car, a 1973
Plymouth Road Runner. Vargas said he would sell the car to Williams for $1,500. On October 7, Williams agreed to the deal and handed Vargas a check for $1,500. Vargas said he would not turn over the
pink slip for the vehicle until the check cleared the bank. The check, however, had been stolen from the camper, and Williams knew it would not clear. He had also noticed Vargas carried around with him cash which Williams wanted for himself. He came up with a plan to rob and kill Vargas and take his property, speaking of how easy it would be to carry out the crime. On October 8, Williams and Tyson headed to Vargas' home in
Merced, arriving at around 7:00 p.m. that evening. Vargas and Meza were at the house along with several others, including 41-year-old Salvador Macias. Everyone sat around downstairs discussing the sale of the car as well as the sale of a gun Williams owned, which Vargas was interested in buying. By 9:30 p.m. everyone had left, and Williams and Tyson headed outside. They took out guns from the car and returned to the house, with Williams pointing a gun at Vargas and holding it to his neck. Tyson turned the situation into a joke, and they both left. Fifteen minutes later, they returned, this time both armed and serious. Tyson held Vargas at gunpoint downstairs while Williams headed upstairs to deal with Macias and Meza, who were the only people left in the house. He then ordered Tyson to take care of Meza downstairs while he handled Macias and Vargas upstairs. After asking Vargas where the check was, he shot both Macias and Vargas twice each, killing them. He then stole two guns, Meza's purse, and the check. Tyson, however, could not kill Meza, so Williams prepared to and began shooting her, causing Tyson to panic. Instead, they took Meza with them and drove away in the car. Williams raped Meza in the back of the car during the drive. After driving for over an hour, they stopped in a remote area near
Tuolumne City. Williams then took Meza from the car and fatally shot her four times, leaving her naked body abandoned in a field. ==Capture and trial==