Mya and the cast of Chicago perform 'All That Jazz' at 'North Shore Animal League's 2008 Tour For Life Grand Finale' Adoption Event at the FAO Schwarz toy store. New York City, USA - 26.04.08

The Grammy Award-winning star was slated to begin a nine-week run as Velma Kelly in the hit musical on 12 May (08).

Producer Barry Weissler says, "Speaking for the entire Chicago creative team, we all wish her a speedy recovery, and look forward to experiencing her portrayal of Velma Kelly as soon as possible."

Source: WENN