Outspoken British rock star Morrissey has canceled two weekend shows in the United States due to a "credible threat on his life." ADVERTISEMENT"In recent days, there has been a credible threat on Morrissey's life," representatives for the venue where the 66-year-old singer was to perform Saturday wrote on Instagram. "Out of an abundance of caution for the safety of both the artist and band, tomorrow's engagement at the MGM Music Hall at Fenway has been cancelled." The vocal critic of British politicians and immigration policies also canceled Friday's concert in Mashantucket, Conn. The move comes more than a week after U.S. conservative activist Charlie Kirk was shot and killed at an event in Utah.