A Teekay LNG shareholder is accusing the gas carrier owner's board of improperly pursuing a deal that ultimately ended with a $6.2bn take-private merger .

Michael Sams of Tennessee filed suit in the US federal court for the Southern District of New York, alleging the process in soliciting and vetting the deal with Stonepeak Infrastructure Partners was "flawed and inadequate" as parent Teekay Corp moved to sell its non-controlling stake in Teekay LNG before contacting Teekay GP's board about selling the entire company.