Joan Lunden is pulling back the curtain on a painful chapter from her early TV career — and the details are disturbing.

In her new memoir, Joan: Life Beyond the Script, the former Good Morning America co-host claims she was sexually harassed by a boss during her early years in local news, long before she became a household name on national television.

Lunden, who worked at WABC in New York before joining GMA in 1980, says the alleged incident happened when she was a young reporter still trying to establish herself in a tough newsroom. According to her account, a superior she identifies only by the pseudonym “Ted” invited her on what he framed as a casual work gathering on Fire Island, describing it as a chance to connect with the team outside the office.

At first, Lunden says she agreed, believing it would be a normal group outing. But once they arrived, she claims it quickly became clear that this was not the professional get-together she had been led to expect.

Instead of a larger newsroom event, Lunden says only one other reporter and his girlfriend were there, making the trip feel more like an awkward and unwanted double date than a work function.

She writes that she immediately felt embarrassed and blindsided, realizing she may have been manipulated into a situation she never would have agreed to if she had known the truth. Lunden says she told her boss directly that this was not what she had signed up for, but alleges he brushed off her concerns and tried to pressure her into simply going along with it.

According to Lunden, the situation became even more uncomfortable when she says he pushed for them to share a bedroom. She refused and ended up sleeping on a sofa instead.

But she claims the fallout did not end there.

After the trip, Lunden says her boss’s attitude toward her changed dramatically. She alleges he began blocking her stories from airing, effectively hurting both her momentum in the newsroom and her paycheck, since reporters at the time earned extra money when their pieces ran on air.

Lunden describes the experience as both humiliating and professionally damaging. In her memoir, she says the alleged retaliation made her feel powerless and sent a clear message that women who rejected unwanted advances could be punished for it.

She says the situation continued for months until she sought advice from her agent and an attorney, who told her she could potentially sue for sexual harassment and discrimination. Armed with that information, Lunden says she confronted her boss directly and warned him she was prepared to take legal action.

That, she says, changed everything.

Lunden writes that the threat of a lawsuit finally got his attention and even led to an apology, allowing them to return to work. But the memory clearly stayed with her, and she is now sharing it publicly as part of her life story.

The veteran broadcaster’s revelation is one of the most personal and serious moments in her new memoir, offering a stark look at the kind of treatment many women quietly endured in the workplace — especially in earlier eras of television news.