The man charged with shooting a 33-year-old in the head and neck on Roosevelt Avenue last week is a suspected gang member, the Queens district attorney said.Authorities believe 20-year-old Pedro Silva of Jackson Heights is part of the street gang M18, the DA’s office said. Silva was charged with murder, criminal possession of a weapon and tampering with evidence in the Sept. 20 shooting death of Corona resident Ivan Rodriguez, according to the borough’s top prosecutor. Silva, along with several other suspected gang members, chased Rodriguez on the Jackson Heights avenue and allegedly shot the 33-year-old in the head and...