An Atlantic City man was arrested Monday after he allegedly shot and killed the son of a city councilwoman outside a motel last week, the Atlantic County Prosecutor’s Office said.According to the Press of Atlantic City Lamar M. Johnson, 26, who also goes by Sheldon Ward, is charged with murder, aggravated assault, aggravated assault with a deadly weapon, unlawful possession of a weapon and conspiracy to commit murder in the death of Kendell Roseborough. He is being held in the Atlantic County jail pending court.Johnson was released from prison in November after serving six months for hindering apprehension, theft, terroristic threats and drug offenses.Roseborough was the son of 2nd Ward Councilwoman LaToya Dunston.