The New Haven Police Department issued an arrest warrant late Thursday night for city resident Markease Hill, 33, for the June murders of Ensley Myrick and Joseph Reed. Hill is already in custody for other crimes, City Hall spokeswoman Jessica Mayorga said Thursday night, though she said she did not know what the other charges were. The murders, which occurred in an East Street parking lot, involved a firearm. Hill’s bail has been set to $5 million. Mayorga said he will be arrested and arraigned for the murder and gun-carrying offenses shortly.