Jose Padilla has been found guilty on charges he conspired to kill people in an overseas jihad and to fund and support overseas terrorism.
He claimed that he was overseas to study Islam, not support terrorism.
Padilla and two co-defendants were convicted on all counts.
According to CNN.com
During the trial, prosecutors played more than 70 intercepted phone calls among the defendants for jurors, including seven that featured Padilla, 36. He is a Brooklyn-born convert to Islam originally arrested as a suspect in a "dirty bomb" plot.
FBI agent John Kavanaugh testified that the calls were made in code, which Padilla used to discuss traveling overseas to fight with Islamic militants, along with side trips to Saudi Arabia and Afghanistan.
In closing arguments, Padilla's lawyers argued he never spoke in code. His voice is heard on only seven of 300,000 taped conversations.
Padilla was originally detained under allegations that he plotted to set off 'dirty bombs' in the United States. Those charges, however, were dropped and were not part of this court case.
Jurors were not told that Padilla was held in a Navy brig for 3.5 years without having formal charges filed against him.
The defense tried to convince the judge, before the trial, that Padilla's confinement and alleged abuse from the government triggered mental incompetence; making Padilla unable to stand trial.
This attempt was futile and the case went on, eventually leading the the jury's decision to find Padilla and his co-defendants guilty on all counts.
They face life in prison.
A sentencing date has been set for December 5th.