Allison Baden-Clay, mother of three young girls from Queensland, was found under the Kholo Creek Bridge at Anstead on April 30. Her body was not identified until the next day, when police officially determined she had been murdered.

Baden-Clay, 43, was reported missing by her husband, Gerard Baden-Clay, on April 20. Police has just received the results of toxicology tests done as part of post-mortem investigation on her remains. However, the results showed no significant information to enable authorities to name suspects or make arrests.

Aussies have been monitoring the progress of investigation into the Baden-Clay case, as sympathies and messages of support poured for the family of the late mother and her three children. (A history of the case is reported here.)

Below are the Top 5 Main Questions on the Baden-Clay murder mystery. It is understood that police authorities have kept some information from the media as part of the process to identify the murder suspect(s).

1. When did Allison disappear? Reports are inconsistent as to when she was last seen. Gerard said she did not come back from her morning walk on April 20, but other reports said she was last seen at her home the previous night. Did Gerard see her before she went out for a walk?

2. Was Allison out for a regular morning walk, or did she storm out of the house after a domestic fight? It has been reported that Allison had found out about Gerard's affair with former staff at the Baden-Clay's real estate franchise. However, other reports the discovery happened a year ago.

3. What clues have the police found in the murder scene? Have they determined whether she was drowned? Was she killed in the creek or was she dumped there? There were reports that police have talked to owners of cars similar to what the Baden-Clays owned. Did it lead them anywhere? Without revealing specific information, police have expressed optimism in solving the case.

''We do have a level of confidence that we will arrest the person responsible for Allison's death,'' Detective-Superintendent Mark Ainsworth told the media.

4. Why can't police use the toxicology test done on Allison's body? According to Dr. Howard S. Robin, a toxicology report "is the result of the lab procedures identifying and quantifying potential toxins" in the subject's body. If no toxins were found in Mrs Baden-Clay's system, what other processes could possibly lead to a breakthrough in solving the murder case?

5. How much time do the investigators need to solve the case? "I've seen cases where forensic testing analysis has taken over a year between when police have sent off evidence to be analysed and when results arrive back," Police Union president Ian Leavers has been quoted as saying.

Allison Baden-Clay was buried on May 11. Her husband did not speak during the funeral, but donations for her three young daughters were requested instead of flowers.

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