Updated

An attorney for a man convicted as a teenager of taking part in deadly sniper attacks that terrorized the Washington area will argue before a Maryland judge that his life sentence is unconstitutional and should be thrown out.

Lee Boyd Malvo, now 32, was convicted in Maryland and Virginia when he was 17 for his role in the 2002 sniper shootings that killed 10 people and wounded three in Virginia, Maryland and the District of Columbia. On Thursday his attorney will argue that his sentence should be tossed because the U.S. Supreme Court has ruled that mandatory life sentences for juveniles is unconstitutional.

Last month a federal judge in Virginia ruled that Malvo is entitled to new sentencing hearings in Fairfax and Spotsylvania counties in light of the Supreme Court's ruling.