The chief executive of Walmart's Flipkart Group, Binny Bansal, is stepping down amid an investigation into "serious personal misconduct," the retailer announced Tuesday. Although the investigation "did not find evidence to corroborate" the allegations against Bansal, it did shed light on the former chief executive's lapses in judgment, particularly a "lack of transparency" in Bansal's behavior, Walmart said in a statement. Bansal, 37, denies the allegations.