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Khairullozhon Matanov is due in federal court Monday for a detention hearing. Matanov is accused of deleting computer files and lying to investigators.Prosecutors said Matanov had dinner with Tamerlan Tsarnaev and his brother, Dzhokhar, hours after the April 15, 2013 bombings.Three people were killed and 260 were hurt. Tamerlan was killed in a shootout with police after he was run over by a car driven by his brother. Dzhokhar is awaiting trial.Azamat Tazhayakov, a friend of Dzhokhar's, is also due in court Monday for a final hearing before his June 30 trial on obstruction of justice charges.