At age twenty, O'Donnell decided to change her agents and her billing name. She left Halliburton for the Herman Zimmerman agency, and by September 1961 was billed as "Erin O'Donnell". and
Incident in an Alley, a noir drama based on a
Rod Serling story. Both movies had been filmed in 1961. She also did one television show that year. The following year (1963) saw her starting to break out of teenage typecasting, as she played more mature roles on four narrative dramas:
Perry Mason,
Arrest and Trial, and two episodes of
Ben Casey. She also did a week-long run on stage in
Just for Tonight, which starred
Gloria Swanson. By 1964 she had lost the babyface look that spelled "teenager" to casting directors, and was graduated from ingenue status to leading woman. That year she had performances on six different television shows, including
Temple Houston,
The Danny Thomas Show, and
Wendy and Me. She had work on three television series for 1965:
Mister Roberts,
My Brother the Angel, and two episodes of
Bonanza. However, she did only one dramatic television series in 1967, and by 1970 finished out her performing career with a minor part in a mixed genre film, ''
Hell's Bloody Devils''. ==Oldsmobile commercials==