Jessica Noy on Thursday admitted previously lying to police when she gave evidence at the murder trial of Joshua Searston, 27, and Dewald De Klerk, 30, at Brisbane Supreme Court.
However, she was adamant she had witnessed Searston stab, "skulldrag" and slap Mr Walsh.
Searston and De Klerk have pleaded not guilty to murdering 35-year-old Mr Walsh in November 2021.
His plastic-wrapped body was found encased in concrete at the bottom of an oil pit at a Coopers Plains transport depot in Brisbane's south in February 2022, the court was previously told.
The jury on Thursday was shown the transport depot's layout that Ms Noy had marked during a police interview in May 2022.
One marking on the layout indicated where Mr Walsh, known as Ghost, was "skulldragged" out by Searston, Ms Noy said.
Red markings also featured on the layout, which Ms Noy said indicated blood trails after Mr Walsh had been attacked.
Two blood trails led to stairs downstairs at the depot, the court was told.
"That's where Ghost was stabbed," Ms Noy told the court.
"By who?" crown prosecutor Chris Cook asked.
"By Josh," she replied.
Defence barrister Anna Cappellano quizzed Ms Noy about her use of methamphetamine between August and November 2021.
Ms Noy told the court she would have three or four shots per day, totalling 0.4 grams in a 24-hour period.
On the night of Mr Walsh's alleged murder she had consumed double her regular amount.
Asked by Ms Cappellano if that would affect her recollection of events, Ms Noy said "no".
Ms Cappellano then took Ms Noy through her evidence at a 2023 pre-trial committal hearing where she said Searston stabbed Mr Walsh with his right hand.
"Do you have a clear memory of what you saw," she asked.
"I have a clear memory of Ghost being stabbed," Ms Noy replied.
"But you can't say whether or not Josh used his left or right hand?" Capellano asked.
"Yep," Ms Noy said.
Ms Cappellano put to Ms Noy that her evidence at the pre-trial hearing, and statements given to police differed from what she was telling the court on Thursday.
Ms Noy admitted lying and providing inaccuracies when giving five police statements in 2022.
But when it was put to her Searston did not stab, "skulldrag" or slap Mr Walsh, Ms Noy rejected the claim.
The jury earlier heard Mr Walsh's body was found by police 2.5 metres into an oil pit at the depot, strapped to a toilet system, wrapped in plastic and encased in concrete.
His body had significant decomposition, nasal bone fracturing, dislodged teeth, fracturing around the right shoulder blade and collarbone along with abdomen stab wounds.
23°C