Posted: Saturday, May 12, 2012 --- 2:52p.m.

LA CROSSE, Wis. (AP) -- A man accused of killing his parents at their western Wisconsin home plans to argue at his trial that a "professional" fatally shot them.

Prosecutors claim Eric Koula, a struggling West Salem day trader, killed Dennis and Merna Koula's in their town of Barre home in May 2010 for the inheritance. He denies a role in the killings.

Koula's attorney Keith Belzer says a "plethora of circumstantial evidence" recovered from the parents' home suggests a trained and organized killer was responsible for their deaths.

Attorneys returned to court Friday to hash out some issues before his 20-day trial begins June 4 in La Crosse County.

The La Crosse Tribune reports (http://bit.ly/K5ORSG) Eric Koula is expected to testify at the trial.

A motion hearing is set for May 30.

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Information from: La Crosse Tribune, http://www.lacrossetribune.com

Copyright 2012. The Associated Press.