Ms. Nasr, a 20-year veteran of the network, wrote on Twitter after the cleric died on Sunday, “Sad to hear of the passing of Sayyed Mohammed Hussein Fadlallah ... One of Hezbollah’s giants I respect a lot.” The ayatollah routinely denounced the United States and supported suicide bombings against Israel.

Image Octavia Nasr

Some supporters of Israel seized on the Twitter message as an indication of bias. A CNN spokesman said Tuesday that Ms. Nasr had made an “error of judgment” that “did not meet CNN’s editorial standards.”

In an explanatory blog post on CNN.com Tuesday evening, Ms. Nasr said she was sorry about the message “because it conveyed that I supported Fadlallah’s life’s work. That’s not the case at all.”

She said she used the words “respect” and “sad” because “to me as a Middle Eastern woman, Fadlallah took a contrarian and pioneering stand among Shia clerics on woman’s rights. She continued, “This does not mean I respected him for what else he did or said. Far from it.”

Despite her senior editor title, Ms. Nasr did not run CNN’s Middle East coverage, a spokesman said. She reported and provided analysis about the region for CNN’s networks.