Ending weeks of speculation about the future of her broadcast career, Katie Couric announced Tuesday that she is leaving the anchor desk at CBS.

"I have decided to step down from the 'CBS Evening News,'" Couric told PEOPLE exclusively. "I'm really proud of the talented team on the 'CBS Evening News' and the award-winning work we've been able to do in the past five years in addition to the reporting I've done for '60 Minutes' and 'CBS Sunday Morning.' In making the decision to move on, I know the 'Evening News' will be in great hands, but I am excited about the future."

"I am looking at a format that will allow me to engage in more multi-dimensional storytelling," Couric, 54, told PEOPLE about her future plans. She says other details, including when and where any new show will air, are "still being discussed."

The Associated Press reported three weeks ago that Couric's tenure as CBS anchor would end just short of five years in the job. Her contract expires June 4.

"There's a lot to be proud of during Katie Couric's time at evening news," said CBS News spokeswoman Sonya McNair. "CBS News, like Katie herself, is looking forward to the next chapter."

CBS has not set an exit date but is expected to appoint Scott Pelley of "60 Minutes" as her successor as early as next week.

Couric was unable to move the "CBS Evening News" out of third place in the ratings.

More at today.msnbc.msn.com.