Richard's sad passing comes after it was revealed that he had been sent to hospital last month after suffering a "life threatening condition", although details of the illness were not given.
He continued, writing: 'He's now with his Mom and Sister.
A representative for Swift said he died on Tuesday morning in Tacoma, Washington.More news: Australias Finch smashes own record for highest T20I score
U.S. rock band The Black Keys have paid tribute to Swift, who was their former touring bassist. "Today the world lost of the most talented musicians I know".More news: England v Colombia LIVE in pictures
He also released multiple solo albums and EP's.
At that time, a GoFundMe was created to help Swift with medical expenses.
A California native born on March 16, 1977, Swift made a handful of solo records in the 2000s and produced albums for such acts as Gardens & Villa, Sylvie Lewis, Damien Jurado and later Guster.More news: Did Vladimir Putin phone call inspire Russian Federation to beat Spain?
He was a mainstay on the national touring roster, supporting bands like The Black Keys, Wilco and The Shins onstage, while maintaining an OR presence at his Cottage Grove recording studio, National Freedom. "We are so grateful you have extended so much generosity and love to our beloved Swift", the update read.