Bobby Farrell, the lead singer of Boney M, a European chart-topping group in the 1970s, died in a St. Petersburg hotel, his agent said Thursday. Farrell was 61. Farrell was found dead in his hotel Thursday morning after failing to respond to a wake-up call, John Seine said. Seine said Farrell performed as scheduled Wednesday night with a group called Bobby Farrell and Boney M, with three women backup singers, but complained of breathing problems before and after his show. Russian authorities said the singer, who was born Alfonso Farrell in Aruba and lived in Amsterdam, died of natural causes. The original Boney M, which was based in Germany, disbanded in 1986 after scoring Europe-wide hits with 'Daddy Cool' and 'By The Rivers of Babylon.' 