MINNEAPOLIS — Adrian Peterson's future with the Minnesota Vikings dimmed further Tuesday, with the NFL suspending the star running back without pay for at least the rest of the season. As his representatives initiated an appeal, Peterson remained at the center of an escalating dispute between the league and the NFL Players Association over the player discipline process. Commissioner Roger Goodell told Peterson he will not be considered for reinstatement before April 15 for his violation of the NFL personal conduct policy — the first example of a crackdown on players involved with domestic violence.