A former University of Waterloo grad student saw his last bid to remain in Canada turned down Friday.

The Supreme Court of Canada upheld an extradition order for Suresh Sriskandarajah, who was arrested in 2006 after a joint FBI-RCMP investigation into the Tamil Tigers Sri Lanka-based terrorist group.

Sriskandarajah, who was living in the Waterloo area at the time of his arrest, is one of two Canadians to be extradited to face charges in the United States.

He allegedly conspired with others to provide support to the Tamil Tigers.

After being arrested, Sriskandarajah was released on $500,000 bail, completed a masters degree in business, and recently moved to Ottawa for law school.

In an email, Sriskandarajah's lawyer said his client had been back in custody since before the decision was rendered.

"The decision is a profoundly disappointing one, not just in the result but also in principle," lawyer Brydie Bethell told CTV News.

Sriskandarajah's trial is expected to take place in New York. If convicted, he could face up to 25 years in prison.