LOS ANGELES (AP) _ One cast member is out and a new one is in on ``Law & Order.''

Elisabeth Rohm, who co-starred in the TNT series ``Bull,'' will join NBC's New York-based legal drama next season as an ambitious assistant district attorney, replacing Angie Harmon.

Harmon, who played prosecutor Abbie Carmichael for three seasons, asked to be released from her contract earlier this month to focus on her personal life. She's marrying New York Giants cornerback Jason Sehorn in June.

``Law & Order'' producers described Rohm's character as gifted and having aspirations beyond the district attorney's office. She will team with prosecutor Jack McCoy, played by Sam Waterston.

Series creator Dick Wolf said Friday he looks forward to ``introducing another new and unique member of the `Law & Order' family.''

Rohm's credits include the NBC miniseries ``The '60s'' and a recurring role on the WB series ``Angel'' as detective Kate Lockley. She also appeared on the ABC daytime drama ``One Life to Live.''

``Law & Order,'' in its 11th season, has had consistent turnover in its ensemble cast, with Michael Moriarty, Steven Hill and Jill Hennessy among the alumni.