'Efficient' Baden-Clay left few clues of murder: court

Gerard Baden-Clay was so efficient at murdering his wife that he left no significant evidence behind, a Brisbane murder trial has been told.

Prosecutors are summing up their case against the former real estate agent, who has denied killing his wife Allison.

On Monday, Baden-Clay's defence team suggested the 43-year-old mother of three jumped or fell to her death in April 2012 after taking an extra dose of anti-depressants.

Mrs Baden-Clay's body was found with no apparent injuries on a creek bank underneath the Kholo Creek Bridge in Brisbane's west on April 30, 2012, ten days after her husband reported her missing.

On Tuesday, Crown Prosecutor Todd Fuller told the jury Allison did not take her own life, but was dispatched "efficiently and effectively" by her own husband.

He reminded jurors that expert witnesses had effectively ruled out the possibility that Allison died from falling, drowning or drug toxicity.

Mr Fuller said her friends, colleagues and a marriage counsellor had all testified that she was upbeat in the days and weeks before her death.

"She's not depressed, she's not suicidal she's not going to wander off on her own accord," Mr Fuller told the Supreme Court.

"If she didn't take her own life and didn't die from misadventure ... then you'll find that she was dumped at the creek at Kholo when she was dead."

Jurors didn't need to know how Allison died or whether she was strangled or smothered, the prosecutor continued.

"Whatever method was employed it was two things; it was efficient and effective," he told the court.

"Effective because it achieved the desired result and efficient, because it didn't leave any significant evidence."

The prosecutor said leaves found tangled in Mrs Baden-Clay's hair and on her jumper "inextricably" linked her death to the couple's Brookfield home, where the Crown says she was killed.

Mr Fuller said the six leaves found in her hair and on her jumper were varieties also found at the family's home. Only two of them were found in the Kholo Creek area.

Baden-Clay has pleaded not guilty to murder.

Mr Fuller is expected to continue his closing address on Tuesday afternoon before the judge sums up the case.