Five grounds for Cameron Mansell's appeal against murder conviction dismissed Cameron Mansell, who was sentenced to life in prison, has had a bid to appeal his murder conviction knocked back. A PERTH court has thrown out most of the grounds for an appeal by Cameron Mansell against his conviction for the murder of Perth multi-millionaire Craig Puddy. Mansell was sentenced to life in prison with an 18-year minimum after a jury found him guilty of murdering Mr Puddy, 45, who went missing in May 2010. After he represented himself in the West Australian Court of Appeal, the three judges unanimously rejected five of Mansell's grounds of appeal, including his claim that the trial judge made errors in law. They also ruled that Mansell's bid for a review of interlocutory decisions should be dismissed. "The appellant has no understanding of the nature, purpose and limitations of an appeal and limited understanding of technical legal principles," court president Justice Carmel McLure said. Mansell, who worked at a bar part-owned by Mr Puddy, has denied he killed his employer after he was confronted about stealing money. During his trial, Mansell's lawyers argued he was at Mr Puddy's home when three thugs entered the house and killed Mr Puddy over a drug debt, and then framed Mansell for the murder. After an eight-week trial, a jury found Mansell guilty of murder. Mansell's remaining grounds of appeal will be argued in April.