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Rock pioneer and Velvet Underground frontman Lou Reed is dead at 71.

Timothy Greenfield-Sanders, director of the feature documentary filmLou Reed: Rock and Roll Heart, confirmed Reed's death Sunday to USA TODAY.

Reed underwent a liver transplant in May, although a cause of death has not yet been released.

Best known for songs such asSweet Jane,I'm Sticking With You,Sunday Morning, andHeroin, the Velvet Underground was formed in New York by Reed and John Cale, and was popular throughout the 1960s. The group was inducted into the Rock and Roll Hall of Fame in 1996.

Reed left the Velvet Underground in 1970 and began a flourishing solo career that spawned such hits asWalk on the Wild Side,Perfect DayandDirty Blvd. Reed took home one Grammy Award during his career of nearly five decades, for best long-form music video in 1999 forAmerican Masters: Lou Reed: Rock & Roll Heart.

After divorcing British designer Sylvia Morales in the mid-'90s, Reed marriedO Supermanperformance artist Laurie Anderson in 2008. In recent years, he toured with his new band Metal Machine Trio, and contributed vocals to Metric's 2012 albumSynthetica.

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