Police in Northern Ireland arrest a man in connection with the 1973 murder of Marian Beattie. Multiple outlets report that Marian Beattie’s body was found at the bottom of a quarry after she had attended a charity dance. The investigation concerns events dating back to 1973, and the arrest is made years later as police continue inquiries into the case. Sky News and other reports state that police confirm the arrest, while additional coverage indicates the suspect is a pensioner and is questioned in connection with the killing. One outlet also reports on the suspect being released on bail following the arrest, though details such as bail conditions are not specified in the information provided. Across the reports, the core facts remain consistent: the victim’s death occurred in 1973, her body was discovered in a quarry, and police say they have arrested and/or questioned a man/pensioner as part of the long-running investigation. No further information about motive or how investigators linked the suspect to the case is included in the supplied summaries.