VANCOUVER - The prosecution in a quadruple murder trial agrees the case against Charles Kembo is only circumstantial.

But Hank Reiner told a B.C. Supreme Court jury in his closing arguments that it was about as powerful a circumstantial-evidence case as you could get.

Reiner said Monday the evidence against Kembo was "compelling and overwhelming" enough to convict.

Kembo is accused of killing his wife, a former girlfriend, his step-daughter and a business partner one at a time between December 2002 and July 2005.

A July 31, 2005 statement by Kembo to police is one of the keys to a conviction, Reiner said.

The jury watched the video earlier in the months-long trial.

"It is very clear, in my submission, that both sides are talking about the same thing and that is four murders. When he tells you he is taking about incest, that doesn't stand up to the slightest scrutiny."

Kembo testified in his own defence earlier in the trial and denied killing the four, but admitted to guilt over an incestuous relationship with his 20-year-old step-daughter Rita Yeung.

He's accused of murdering Yeung, his wife Margaret Kembo, his business partner and friend Ardon Samuel and his girlfriend Sui Yin Ma.

The Crown's case has been based on the premise Kembo killed the four to use their identification in a money-making fraud scheme.

In his closing statements, Kembo's lawyer said the prosecution is trying to fit a square peg in a round hole in order to convict his client.

Don Morrison said there is no direct evidence that Kembo was involved in any of the deaths.

"There is no physical evidence at all between Mr. Kembo and these victims. There is no direct evidence that Mr. Kembo was involved in any of the victims' deaths," Morrison told the jury Monday.

"The circumstantial evidence relied on by the Crown is not a proper evidentiary basis for a conviction."

But Morrison also qualified the statement, noting the vaginal swab with semen taken from the body of Yeung was linked to Kembo.

Morrison told the jury that even if they find he lied to cover up a fraud, that doesn't make him a murderer.

Reiner too cautioned the jury that just because Kembo admitted while testifying that he committed fraud, that didn't mean he was a killer.

But Reiner said the jury should look at the defence's evidence that didn't stand up under cross examination.

"He had a very self-serving memory," he said. "When it suited his purpose, he couldn't remember the most fundamental, significant events."

Even more damning, Reiner said, was Kembo's constant addition of significant new details when he was cornered.

"It's a sign of someone making things up as they go along."

Margaret Kembo's body was never found while the bodies of the other two women were found in Richmond, B.C., and his business partner was found strangled in a Vancouver park.

The trial heard that Kembo's wife told a passport officer she was going away and that she had considered suicide, had paid psychics about $100,000 and was spending large amounts of cash.

When she disappeared in December 2002, Kembo told the trial he assumed she had entered a Buddhist monastery in Hong Kong.

"All of this evidence is consistent with Margaret Kembo being under stress and finally saying I've had enough," Morrison told the jury.

He told the jury the accused must not be convicted on a guess, no matter how shrewd that guess.

Morrison said the police investigation had "tunnel vision," and investigating officers didn't take DNA samples from other suspects that may been linked to the murder scenes.

"It does exhibit certain deficiencies which might have been very helpful to clarify the evidence for you," he told jurors.