Montee Tyree Johnson was charged yesterday with first degree murder while armed.

According to lawyers in the first-degree murder case of former D.C. school principal Brian Betts, the finger-pointing has started to fly among the four accused teens. Police suspect all four, Sharif Tau Lancaster, Alante Saunders, Deontra Gray and Joel Johnson, responded to Betts’ sex chat line offer to meet up at his Silver Spring home in April, intending to rob him. Betts was found dead the next day by a coworker from gunshot wounds. WTOP…