Three arrested for July murder in Ashmont

Boston Police report charging Tyshawn Pereira of Mattapan, 21, with the July 11 murder of Jean Louis on Bailey Street. Two other men, Michael Johnson-McNeil, 19, and and Bobby Robinson-Gilmere, 21, both of Dorchester, were charged as accessories after the fact.

Police report Pereira was already in custody on an unrelated matter. Johnson-McNeil and Robinson-Gilmere were arrested Friday by detectives from the homicide, gang and drug-control units, police say.

The three are scheduled for arraignmentMonday in Dorchester Municipal Court.