Casting calls for Jackson's replacement began during the summer of 1979. Several up-and-coming actresses were considered for the role, including Barbara Bach, Connie Sellecca, Shari Belafonte, Judith Chapman, newcomer Michelle Pfeiffer and The Price Is Right model Dian Parkinson. ABC producers auditioned Revlon Charlie perfume model Shelley Hack and cast her as Jackson's replacement. Producers at Spelling-Goldberg were quoted as saying: "We feel that Shelley Hack has exactly the talent, style, and intelligence we were looking for". Producer Spelling loved the idea of the headline "The Charlie Girl Becomes A Charlie's Angel". Hack debuted in the fourth-season premiere as Tiffany Welles, who graduated "top of her class" from the Boston police academy and recruited from the Boston Police Department. In hiring Hack, Spelling's priority for season four was to "bring back the glamour"Gough-Yates, Anna, (December 16, 2001) Action TV: Tough-Guys, Smooth Operators and Foxy Chicks. Routledge Publishing, p. 95, while ABC hoped Hack's sophisticated personality would bring an interesting new mystique and intrigue to the series. However, after an initial spike in the ratings, they began to erode, so in an attempt to revitalize declining ratings and regain popularity, ABC released Hack from her contract in February 1980. A statement later issued by Spelling-Goldberg read: "When she signed her contract for the series, Miss Hack had a personal agreement that she could review her continuation with the show at the end of her first season since series television represented an enormous change in her career and lifestyle", implying that Hack was included in the decision to exit Charlie's Angels. In an interview with People, Hack said: "They can say I didn't work out, but it isn't true. What happened was a network war. A business decision was made. Change the timeslot or bring on some new publicity. How to get publicity? A new Angel hunt. Who is the obvious person to replace? I am—the new kid on the block". Hack later stated: "I never expected to be there more than a year and I wasn't. I did my year and I moved on".
Casting calls for Jackson's replacement began during the summer of 1979. Several up-and-coming actresses were considered for the role, including Barbara Bach, Connie Sellecca, Shari Belafonte, Judith Chapman, newcomer Michelle Pfeiffer and The Price Is Right model Dian Parkinson. ABC producers auditioned Revlon Charlie perfume model Shelley Hack and cast her as Jackson's replacement. Producers at Spelling-Goldberg were quoted as saying: "We feel that Shelley Hack has exactly the talent, style, and intelligence we were looking for". Producer Spelling loved the idea of the headline "The Charlie Girl Becomes A Charlie's Angel". Hack debuted in the fourth-season premiere as Tiffany Welles, who graduated "top of her class" from the Boston police academy and recruited from the Boston Police Department. In hiring Hack, Spelling's priority for season four was to "bring back the glamour"Gough-Yates, Anna, (December 16, 2001) Action TV: Tough-Guys, Smooth Operators and Foxy Chicks. Routledge Publishing, p. 95, while ABC hoped Hack's sophisticated personality would bring an interesting new mystique and intrigue to the series. However, after an initial spike in the ratings, they began to erode, so in an attempt to revitalize declining ratings and regain popularity, ABC released Hack from her contract in February 1980. A statement later issued by Spelling-Goldberg read: "When she signed her contract for the series, Miss Hack had a personal agreement that she could review her continuation with the show at the end of her first season since series television represented an enormous change in her career and lifestyle", implying that Hack was included in the decision to exit Charlie's Angels. In an interview with People, Hack said: "They can say I didn't work out, but it isn't true. What happened was a network war. A business decision was made. Change the timeslot or bring on some new publicity. How to get publicity? A new Angel hunt. Who is the obvious person to replace? I am—the new kid on the block". Hack later stated: "I never expected to be there more than a year and I wasn't. I did my year and I moved on".