ALBUQUERQUE, N.M.—A man considered a person of interest in the deaths of his ex-wife and three other people in New Mexico was charged Wednesday with a separate killing in New Jersey. Sean Lannon was arrested in St. Louis on Wednesday morning after a manhunt stretching from New Jersey to Missouri. Wednesday afternoon, authorities in Gloucester County, New Jersey, charged the 47-year-old with murder, robbery, burglary, theft of a motor vehicle and other offenses in the death of 66-year-old Michael Dabkowski. Dabkowski was killed Monday in his home in East Greenwich, about 20 miles south of Philadelphia. The cause of death was blunt force trauma, according to the Gloucester County prosecutor’s office. Officers performing a well-being check found Dabkowski’s body, according to the prosecutors office. On Tuesday, the prosecutor’s office said Lannon was believed to be driving a blue 2018 Honda CRV and had possibly been seen in Camden, in southern …