She later married Venezuelan oil man Roberto De La Vega and later, inherited his company, De La Vega Oil. In 1991, she bought Ewing Oil from Bobby Ewing and the company became a wholly-owned subsidiary of De La Vega Oil. She taunted J.R. by letting him remain at Ewing Oil and managed to end J.R.'s relationship with Vanessa Beaumont by seducing J.R. Having her revenge against J.R., Lee Ann left Dallas and sold Ewing Oil to Michelle Stevens.