A federal jury ruled Jerry Varnell, 24, guilty of trying to bomb the BancFirst building in downtown Oklahoma City.
Jurors convicted Varnell yesterday of attempting to use an explosive device and a weapon of mass destruction.
Testimony in the case began February 12th.
Prosecutors called FBI witnesses and used recordings to show how Varnell participated in an undercover plot to try to blow up an Oklahoma bank.
Varnell pleaded not guilty and the defense claimed he was entrapped.
His parents testified Varnell has a history of schizophrenia.
Varnell will be sentenced in about 90 days and could face life in prison.