FILE - This Nov. 13, 2008 file photo shows Oscar De La Rosa, lead singer for the Tejano group La Mafia, at the 9th annual Latin Grammy Awards in Houston. De La Rosa was knocked unconscious by a man in an unprovoked attack outside a Houston club on Monday, May 13, 2013. De La Rosa has facial cuts, eye damage and he lost two teeth. La Mafia is considering whether to cancel any performances. The band, which formed in 1980 in Houston, won a Grammy in 2006 for the album, "Nuevamente." (AP Photo/LM Otero, file)

Associated Press
FILE - This Nov. 13, 2008 file photo shows Oscar De La Rosa, lead singer for the Tejano group La Mafia, at the 9th annual Latin Grammy Awards in Houston. De La Rosa was knocked unconscious by a man in an unprovoked attack outside a Houston club on Monday, May 13, 2013. De La Rosa has facial cuts, eye damage and he lost two teeth.   La Mafia is considering whether to cancel any performances. The band, which formed in 1980 in Houston, won a Grammy in 2006 for the album, "Nuevamente." (AP Photo/LM Otero, file)
FILE - This Nov. 13, 2008 file photo shows Oscar De La Rosa, lead singer for the Tejano group La Mafia, at the 9th annual Latin Grammy Awards in Houston. De La Rosa was knocked unconscious by a man in an unprovoked attack outside a Houston club on Monday, May 13, 2013. De La Rosa has facial cuts, eye damage and he lost two teeth. La Mafia is considering whether to cancel any performances. The band, which formed in 1980 in Houston, won a Grammy in 2006 for the album, "Nuevamente." (AP Photo/LM Otero, file)
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