Rosie O’Donnell’s 7 p.m. talk show on OWN, Oprah Winfrey’s struggling cable network, is being canceled after just five months.

“The Rosie Show” will tape its final episode on Tuesday, the network said in a news release on Friday night, after weeks of speculation about its fate.

Ms. O’Donnell and her producing partners initially pitched the talk show as a replacement for “The Oprah Winfrey Show,” the popular daytime series that concluded last May. When “The Rosie Show” was acquired by OWN last year, it was produced inside Ms. Winfrey’s old studio in Chicago and was portrayed as a tent-pole of the channel’s daily programming.

But only a small number of viewers ever found the show. It had its premiere on Oct. 10 and drew less than 500,000 viewers. That number leveled off at around 200,000 on any given night. Ms. O’Donnell acknowledged the ratings shortfalls in a statement on Friday night. “It was a great year for me — I wish the show was able to attract more viewers — but it did not. So I am headed back to my home in New York — with gratitude. On we go!”

The Chicago Tribune reported this month that Ms. O’Donnell was under contract until 2013. The newspaper asserted that the show suffered from a “top-heavy organization plagued by turnover among executive producers during the show’s brief history.” It also cited a “fundamental culture clash” between the producers of Ms. Winfrey’s former program in Chicago and other producers hired specifically for “The Rosie Show.”

“Even now,” the newspaper stated, “no one working on the show seems to agree on what it should be, let alone how to get it done.”

In a statement on Friday night, Ms. Winfrey, the chief executive of OWN, thanked Ms. O’Donnell for “working to deliver the best possible show every single day.”

“As I have learned in the last 15 months, a new network launch is always a challenge and ratings grow over time as you continue to gather an audience,” she said. “I’m grateful to Rosie and the dedicated ‘Rosie Show’ team for giving it their all.”

Nicole Nichols, a spokeswoman for OWN, did not say specifically what would replace “The Rosie Show” after March 30, when the final repeat episode is shown. “We will be using series from our OWN library,” she said.