October 21, 2010 at 12:48 PM EDT

Ari Up, singer in the British punk band the Slits, died yesterday at age 48. Her stepfather, John Lydon, a.k.a. Johnny Rotten of the Sex Pistols, announced her passing on his blog, citing the cause of death as a “serious illness.” Up, whose real name was Arianna Forster, helped to form the seminal all-girl band in 1976, when she was just 14.

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