Nursing home operator Mariner Health Care Inc. sued its former law firm Troutman Sanders for allegedly allowing $40 million from an asset sale to go to another client and trying to paper over the payment after the fact.

Money from the $50 million sale of a medical supply unit to Omnicare Inc. went to Rubin Schron, an investor who bought some of Mariner’s real estate through a company he controlled, according to a complaint filed Nov. 9 against the law firm in Fulton County State Court.