Chuck Knoblauch surrendered to authorities in Harris County, Tex., Tuesday after he was charged with assaulting his common-law wife. Knoblauch, who was named in the Mitchell Report as a player who used performance-enhancing drugs, took the anti-anxiety medication Xanax and had been drinking heavily Friday night when he hit and choked Stacey Stelmach, according to prosecutors. Knoblauch was charged with assault of a family member. A change in Texas law that took effect Sept.1 makes it a felony to choke a family member, and the former All-Star faces up to 10 years in prison and a $10,000 fine, Harris County Assistant District Attorney Donna Hawkins said.