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Kristin Shepard, was a character in the popular American television series Dallas, played most notably by Mary Crosby (1979-1981) and briefly played by Colleen Camp (1979).

Kristin was Sue Ellen Ewing's scheming sister, who eventually has an affair with Sue Ellen's husband J.R..

The character of Kristin first appeared on Dallas during the second season in the company of her mother, Patricia Shepard (Martha Scott). Patricia was always proud that her daughter Sue Ellen (Linda Gray) had married into the Ewing family. Patricia was hoping her younger daughter Kristin (then played by Colleen Camp) would also find a successful man to marry. Kristin spent some time at Southfork Ranch and J.R. (Larry Hagman) came up with a plan for the vixen Kristin to seduce Bobby. (Bobby had just recently separated from his new bride Pam and J.R. was plotting to break them up for good.) J.R.'s plan backfired. Bobby wasn't interested in Kristin romantically and nothing happened. Bobby and Pam reconciled. Kristin left town for awhile.

Kristin (now played by Mary Crosby) returned to Dallas at the beginning of the third season. J.R. offered Kristin a job working for him at Ewing Oil and a condo for her to live in. Eventually, J.R. and Kristin began a long term affair. Kristin helped J.R. by finding out valuable information from J.R.'s business partners. J.R. failed to come through on the promises he made to Kristin that she would be rewarded for the spying she had done. Kristin became bitter with J.R., feeling he had betrayed her. J.R. had also managed to anger many of his business partners and family members. J.R. was shot by an unknown assailant at the end of Dallas's third season.

In the beginning of the fourth season, Sue Ellen (falsely accused of shooting J.R.) realized that her sister Kristin had shot J.R. and the truth came out in a poolside conversation between the three of them. Before J.R. (in a wheelchair) had a chance to digest this news flash, Kristin revealed that she was pregnant with J.R.'s child. Instead of pressing charges against Kristin for the shooting, J.R. sent her packing out of town and agreed to send her a monthly check for living expenses.

At the end of the fourth season, Kristin returned yet again and soon thereafter was found drowned in the Southfork Ranch swimming pool, after having overdosed on drugs and hitting her head after losing consciousness and falling over the railing of the upper balcony. After Kristin's death, it was learned that J.R. was not the father of Kristin's child. Bobby and Pam adopted her son and named him Christopher.

Kristin would make one final appearance in the series finale in J.R.'s "dream" sequence as he finds out what life would be like if he had never been born. In the "dream" it is revealed that Kristin is a con artist.