By Jonathan Stempel (Reuters) -A Skechers USA shareholder has sued the footwear maker for more details about its $9.4 billion buyout by private equity firm 3G Capital, saying the decision by Skechers' founder and controlling shareholder to sell raises "red flags." According to a complaint filed on Thursday in Los Angeles federal court, founder Robert Greenberg and his family, who hold about 60% of Skechers' voting power, appear to have "controlled the sales process to a single bidder and deprived the minority stockholders of any legitimate bidding process." Florida-based Key West Police Officers & Firefighters Retirement Plan said the buyout should not close until Skechers makes required disclosures with the U.S. Securities and Exchange Commission to help shareholders decide if the terms are fair.