WASHINGTON (AP) - Lawyers for a man convicted of killing Washington intern Chandra Levy have filed a court document detailing reasons he should be granted a new trial.

The 84-page document filed Tuesday in Washington comes after months of periodic hearings involving a potential problem with a key witness in the case of Ingmar Guandique.

The filing, which had been expected, contends that during Guandique's 2010 trial a key witness - Guandique's one-time cellmate Armando Morales - gave false or misleading testimony. Guandique's lawyers say they weren't given information they should have received and prosecutors didn't investigate Morales fully enough.

Morales testified Guandique confided in him that he was responsible for Levy's murder. His testimony was some of the most powerful because there was no physical evidence linking Guandique to Levy's death.