Lee and Kelly went to a bedroom and injected the methylamphetamine. Walker and the deceased smoked cannabis. Later that evening, Walker remarked to Kelly, 'I'm going to kill [the victim]', while looking outside in the direction of the [victim]. A short while later, Walker came up behind Kelly and put a shoelace around her throat. He said to her, 'Do you think this will work?'.
Walker, Lee and Kelly obtained further methylamphetamine from the [victim]. After consuming the drug, Lee and Kelly went into a bedroom and then the bathroom to have sex. The [victim] remained in the kitchen or lounge room with Walker.
Walker obtained a cord or ligature from somewhere in the house. He cut it with a pair of secateurs and then put it over the [victim]'s neck and around his throat and began to strangle him. The [victim] screamed. His screams brought Lee and Kelly out of the bathroom to the kitchen area to find Walker lying on his back on the ground, choking the [victim], who was struggling, with the cord.
The [victim] tried to resist. With his legs flailing about, he tried to get the cord off his throat. Walker screamed for help, saying that he was slipping.
At this point, Kelly grabbed string or something similar and joined with Walker in trying to choke the [victim]. The [victim] continued to struggle. Kelly called out words to the effect of, 'Knock him out'. Lee, in rapid succession, kicked the [victim] three times in the face. He did so with such force as to cause his eye to bulge out of its socket, causing substantial bleeding. Walker continued to choke the [victim].
Walker moved to the side of the [victim]. Lee told him to put his forearm under the [victim]'s neck, which he did. Lee then stomped on the [victim]'s head as hard as he could. Lee then leant down and further punched the [victim] to the head about four times. Lee believed that he had fractured the [victim]'s skull. Walker then continued to choke the [victim] for about 30 seconds until both Walker and Lee believed him to be dead.
Lee and Walker dragged the [victim] into the shower in the bathroom, which was still running. Lee left briefly to check on Kelly. When he returned, he heard a loud gasp coming from the [victim]'s body.
Concluding from the gasp that the [victim] was still alive, Lee kicked him in the chest about four times. He then went through the [victim]'s pockets and took his mobile telephone. Lee went and obtained rope from a shed. Meanwhile, Walker and Kelly started to clean up the blood from around the kitchen.
When he returned to the bathroom, Lee took the [victim]'s body outside and wrapped it in a barbeque cover. Walker assisted Lee in tying the barbeque cover with the rope.
Lee then got dressed and took the [victim]'s other mobile telephone and debit card. He went to Walker's car and reversed it closer to the house. With the aid of some chipboard, Lee and Walker dragged the [victim]'s wrapped body outside and into the boot of Walker's car. Walker went back inside and Lee drove the car to the end of the street.
Walker had sufficient time to clean up and have a shower before his father returned later that night. He had a casual conversation with his father. Lee left and drove to his parents' home in Murdoch, disposing of the [victim]'s mobile telephones in a skip bin along the way.
At about 5.00 am the next morning Walker went to see Lee at his parents' home and discussed with him what to do with the [victim]'s body, which was still in the back of Walker's car. The two men went back to Walker's house and smoked cannabis. Walker went to a nearby Bunnings store and hired a utility and Lee returned to his parents' home.
Walker later transferred the body to the tray of the utility, concealing it by placing some doors on top of the body. Walker drove to an isolated area of land on the outskirts of Bunbury, dug a shallow grave and put the [victim]'s body in it. He then poured acid over the body to assist in its decomposition before filling the grave with sand, tar and concrete.
The GPS in the hired utility led the police to the gravesite. Lee was interviewed on 30 May 2012 and admitted being involved in the [victim]'s murder. Walker was interviewed on 1 June 2012 and also admitted being involved in the [victim]'s murder. Both pleaded guilty to the charge at the first reasonable opportunity.
The sentencing judge found that each of Walker and Lee intended to cause the death of the [victim] [7] - [21].