(May 4) -- Maryland police have arrested a fourth person in connection with the killing of Brian Betts, a popular Washington public school principal, and say the suspects had contact with him on a sex chat line shortly before he died. WTOP reported this morning that Deontra Gray, 18, has been charged with Betts' murder and that robbery was the motive. Police on Monday also charged Alante Saunders and Sharif Tau Lancaster, both 18, with murder. Artura Otey Williams, 46, Lancaster's mother, was taken into custody Monday and charged with two counts of credit card misuse described by police as...