Testimony from witnesses linking Robert William Pickton to the deaths of six women can't be dismissed as the guesswork of liars, the lead Crown prosecutor in the case said Friday.

Mike Petrie pointed accusingly at Pickton in the witness box as he sought to re-establish the credibility of three of the Crown's key witnesses during the second day of his closing arguments at the B.C. Supreme Court in New Westminster.

Robert William Pickton is on trial for the deaths of six women who went missing from Vancouver's Downtown Eastside.
(CBC)

Pickton, a Port Coquitlam pig farmer, is charged with first-degree murder in the deaths of Sereena Abotsway, Mona Wilson, Andrea Joesbury, Brenda Wolfe, Marnie Frey and Georgina Papin. He'll face another 20 murder charges at a later date.

Pickton has pleaded not guilty to all charges.

Petrie admitted to the jury that his key witnesses are "unsavoury," but added that's no reason to throw out their testimony.

The Crown's three major civilian witnesses — Scott Chubb, Lynn Ellingsen and Andrew Bellwood — spent days on the stand being torn apart by the defence. 

Petrie reminded the court when they'd been right. Chubb told police, for example, that there were illegal guns on the property and there were, he said.

Chubb also said Pickton told him "a good way" to kill prostitutes is with a syringe filled with windshield washer fluid, said Petrie. One such syringe was found in Pickton's home, court heard.
 
In their closing arguments earlier this week, the defence urged jurors to reject the witnesses' evidence, saying their history of lies, drug addiction and in some cases criminal records rendered them unbelievable.

Petrie suggested inconsistencies in their testimony may have been due more to the stress of being witnesses, calling them not well-educated people who were being asked in great detail about personal, traumatic events.

Petrie went on to discuss Ellingsen.
 
Long before any butchered remains were found on the farm, she told police she'd seen the body of a woman hanging in the farm's slaughterhouse, and that Pickton had cut her up, Petrie said.

Petrie turned to the jury, saying incredulously: "Is that just a lucky guess?"

He said Ellingsen's inability to pinpoint it to a certain date was just a trick of memory.

He said there is a "constellation" of evidence that points to Pickton as the killer of the six women from Vancouver's Downtown Eastside.

The Crown's closing arguments are expected to finish early next week.

With files from the Canadian Press