A jury found Kyle Hamm guilty of the 2018 deaths of David and Charla Taylor.
The verdict was delivered late Monday afternoon.
It took the jury just a few hours to find Kyle Hamm guilty of two counts deliberate homicide, as well as tampering with evidence and drug possession.
David and Charla Taylor's bodies were found in the Cayuse Road home on March 18, 2018.
Throughout the trial, the prosecution and defense agree Hamm went to the home that night, along with the Taylor's son Kaleb and another man, Journey Wienke.
Hamm told authorities he waited outside while Taylor and Wienke went in.
Kaleb Taylor has admitted he then attacked and killed his parents.
Prosecutors argued Hamm should also be convicted of homicide, because he was legally accountable for a robbery at the Taylors' home, and their deaths happened in the course of that crime.
Defense attorneys said the evidence suggested that the Taylors were killed before any items were taken, Do their deaths couldn't be connected to a robbery.
The judge did not set a date for sentencing.
Taylor pleaded guilty to killing his parents and is currently serving two life sentences.
The third defendant, Journey wienke is scheduled to stand trial later this month.