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Police believe Allison Baden-Clay's killer may have had an accomplice.

According to the Courier Mail, investigations into a second person's involvement in the murder and cover-up have begun.

Mrs Baden-Clay was reported missing by her husband Gerard three weeks ago, with a canoeist discovering her body 11 days later under a bridge at Kholo Creek in Brisbane's west.

It is still not known how long her body had been under the bridge, though forensic testing will confirm if Mrs Baden-Clay was there from the time of her murder or whether her body subsequently washed up on the creek bed.

Police investigating the discovery of Allison Baden-Clay's body on April 30.

Gerard Baden-Clay hired a lawyer shortly after reporting his wife missing, sighting intense media scrutiny over the event.

News Limited reports a colleague of Mr Baden-Clay's has also hired a lawyer, after facing questioning on three separate occasions.

The woman, who works at Century 21, is listed as a joint-selling agent with Mr Baden Clay on a number of properties.

Police are still hunting for Mrs Baden-Clay's iPhone and anyone who had driven through the roundabout on Brookfield and Moggill roads on the night of April 19.

The funeral for the mother of three will be held on Friday.

Anyone with information is urged to contact Crime Stoppers on 1800 33 000.