A jury has failed to reach a verdict in the trial of a WA farmer, accused of incinerating his wife in a staged car crash 10 years ago.
Gregory Paul Johnston was charged last year with murdering Susi Johnston on their Borden farm in December 2008.
Prosecutors claimed he watched the 56-year-old burn to death inside a stationwagon, which he drove into a tree and set on fire.
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"Please forgive me and accept my apology, to all who are affected by this."
Thaller, 67, appeared in court on Friday having pleaded guilty to one count of impeding a police investigation.
He admitted he washed and hid a two-kilogram spanner used by Penhall to murder Mr Norris in Adelaide's northern suburbs in September 2017.
Thaller also admitted giving a false statement to police in the hours following the murder.
The court heard all three had affiliations with the Hell's Angels outlaw motorcycle gang.
Prosecutor Jim Pearce QC highlighted Thaller's dishonesty towards Mr Norris' family and asked Justice Malcolm Blue to take a sceptical approach to his apology.
"He sat with the family at the funeral, (they were) totally oblivious to what he had done," Mr Pearce said.
"He was there peddling his remorse and sympathy."
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Mr Pearce has previously alleged Thaller's actions were a deliberate attempt to mislead the police investigation, but defence counsel Stephen Ey said on Friday that was "over-egging the pudding".
Mr Ey argued CCTV footage showed his client had acted impulsively and out of panic.
"Partially cleaning the spanner, and not doing a good job of that, is hardly the actions of a man who is thinking clearly," he said.
"Who wouldn't panic in those circumstances?"
Mr Pearce disagreed, telling the court Thaller immediately set about trying to conceal a "brutal murder".
He said Thaller was not of good character because he spent 29 years as a member of the Hell's Angels and was involved in a prostitution ring.
Penhall was last year found guilty of murder and is awaiting sentence, while Justice Blue will so sentence Thaller on a date to be set.
