A man wanted for questioning in connection with the slaying of a Gloucester County man and who is also a person of interest in four killings, including of his ex-wife, in New Mexico has been arrested in St. Louis. Sean Lannon, 47, of Grants, New Mexico, was caught Wednesday morning by members of the U.S. Marshal’s St. Louis Metro Fugitive Task Force, according to acting Gloucester County Prosecutor Christine Hoffman. Details of the arrest were not disclosed. He is wanted for questioning about a homicide in East Greenwich involving a man in his 60s, according to Hoffman, who did not disclose details of the case. She said upgraded charges are expected.