PHILADELPHIA — Three of the teens accused of shooting five young football players, killing one, outside Roxborough High School in September are expected to be charged with murder in connection with another fatal shooting the day be fore, police said Friday. Troy Fletcher, 15, and Zyhied Jones, 17, could face the new murder charges as early as Friday afternoon for the killing of 19-year-old Tahmir Jones in North Philadelphia on Sept. 26, said Deputy Police Commissioner Frank Vanore. Police also expect to charge Dayron Burney-Thorne, 16, who is wanted in the Roxborough case but remains a fugitiv…