The grandson of Malcolm X (who set a 1997 fire that killed the civil rights leader's widow Betty Shabazz) will spend at least another year in detention as a result of his unlawful escape from a juvenile detention center, a judge in Yonkers, N.Y., ruled Tuesday. Malcolm Shabazz, 14, pleaded guilty to the juvenile equivalent of third-degree escape, a misdemeanor. His sentence, which had been scheduled to end in February 2000, was extended another six months by the judge and is now scheduled to end in August 2000. (The sentence can be extended yearly until he is 18.) Since being in detention, Malcolm has run off three times.