The Sensex ended 77 points lower ahead of the futures and options expiry, while the rupee slipped below 60 against the US dollar for the first time. Key sectors like automobiles and metals declined, while information technology and power gained. Tata Consultancy Services and Hero MotoCorp were among the top Sensex gainers, while Bharti Airtel and Mahindra & Mahindra saw losses. Trading was volatile and most indices closed in the red zone.