Updated at 1:23 p.m.: A handwriting expert who formerly worked for the Georgia Bureau of Investigation has determined that the signature in the yearbook of one of Roy Moore's accusers is authentic, according to the accuser's lawyer.

Gloria Allred, attorney for Beverly Young Nelson, said the Georgia-based handwriting expert retained by Nelson, Arthur Anthony, studied multiple examples of original and copies of signature samples of Moore's in reaching his conclusion.

Allred made the announcement at press conference in Atlanta.

Posted by WHNT News 19 on Friday, December 8, 2017

Allred also said that she believes Nelson's life is in danger because she had alleged that Moore sexually assaulted her when she was 16 in late 1977 or early 1978. Moore has repeatedly denied that allegation as well as all others made by women who have come forward in recent weeks.

Nelson has more evidence against Moore that she is withholding at this time but would be used in an ethics investigation against Moore if he wins Tuesday's election against Democrat Doug Jones.

Moore has said he would welcome an independent analysis of the yearbook signing but Allred has insisted that such an analysis would have to be part of a Senate judicial or ethics hearing, which has not taken place.

Moore has said he did not sign the yearbook and he does not know Nelson as well as any of his other accusers.

The Moore campaign has called a 3 p.m. press conference in Montgomery to respond to Nelson and Allred's press conference comments.

Among the handwriting examples studied by the expert, Allred said, was a graduation note another woman, Debbie Wesson Gibson, said she received from Moore. Gibson said that she and Moore dated for a few weeks when she was 18 and Moore was 34. Gibson said their physical relationship never advanced beyond kissing and hugging.

"We think it's important evidence that supports Beverly statements that Roy Moore asked to sign her yearbook when she was just 16 years old," Allred said at the press conference. "And it demonstrates that when Roy Moore stated 'I do not know any of these women,' that statement does not appear to be true."

Nelson addressed her concerns for her safety at the press conference.

"Since I spoke about my experience with Roy Moore when I was only 16 years old, I have been the target of threats and lies," she said. "A talk radio host said that I should be put in the town square and stoned and he said he wanted to be the first to throw the largest stone at me. Someone even sent me a photo of a casket, which I took as a threat.

"As a result, I have had to live behind triple-locked doors, tinted windows, I've even had to have security accompany me when I went to a doctor's appointment."

Later, Nelson said, "I refuse to be intimidated into silence or retract anything that I've said."

Allred spoke of her concerns for Nelson's safety at the end of the press conference.

"I think she's in danger; she knows it," Allred said. "There are people who feel very comfortable saying things like, 'She should be stoned in the town square' and sending a photo of a casket. Who does that? And she's still here and she's still willing to share what she says is the truth about her life. I'm just honored to know her."

Allred was asked about Nelson being accused of forging the yearbook entry because she acknowledged Friday, for the first time, that she added the date and location of the signature to what she said was Moore's yearbook signature.

"That's what we call a red herring," Allred said. "It's also a defamatory statement to accuse her of a crime. So I would say anyone who accuses her of a crime or me should proceed at their own risk and own peril. And I would say such risk and such peril is significant under the circumstances.

"The key is to not be distracted to the fact that the expert attest to his conclusion it was Roy Moore's signature in her yearbook and that the inscription that he wrote to her ... is that of Roy Moore. Why is that relevant? That's relevant because at one point, Mr. Moore indicated he did not know these women and it's also relevant because supporters of his campaign have been saying that's not his signature, he didn't write that."

Original story: Beverly Young Nelson, the former Gadsden waitress who presented her high school yearbook she said was signed by Roy Moore, altered the story she originally told regarding the yearbook signature.

In an interview Friday with ABC's Good Morning America, Nelson said she made some notes in the yearbook below where Moore signed it. Underneath Moore's alleged signature is a date and location that Nelson said Moore signed the yearbook - "12-22-77" and on the next line "Olde Hickory House," the restaurant where Nelson worked and she said Moore was a frequent customer.

Beverly Young Nelson shows her high school yearbook signed by Moore, at a news conference, in New York, Monday, Nov. 13, 2017. (AP Photo/Richard Drew)

At her original press conference making the allegations on Nov. 13, Nelson said that Moore signed the yearbook and made no references to any notes she added later.

Moore's defenders have pointed to differences in the handwriting - specifically the 7s - as indicators the yearbook entry was not authentic. Within the note Nelson said Moore wrote are the words "Christmas 1977" - and the 7s appear to be different from ones in the 12-22-77 notation written at the bottom that Nelson has now revealed she wrote herself.

Nelson will hold a press conference Friday afternoon in Atlanta. According to a press release from the office of her attorney, Gloria Allred, expert evidence that Moore signed the yearbook will be presented.

Moore, the Alabama Senate Republican nominee, has repeatedly denied knowing Nelson or signing her yearbook or attempted to sexually assault her as she has claimed.

Beverly Young Nelson, one of the women accusing GOP Senate candidate Roy Moore of sexual misconduct, tells @GMA it “sickens” her to think what might happen if Moore is elected. https://t.co/wuEGWr0kng pic.twitter.com/lcp5OY4x3A — ABC News Politics (@ABCPolitics) December 8, 2017

The election between Moore and Democrat Doug Jones is Tuesday.

Nelson first made her allegations four days after The Washington Post first reported on allegations by Leigh Corfman, who said she was 14 years old when Moore undressed her and touched her over her underwear and guided her hand to touch him over his underwear.

Moore has denied all the allegations made by the women, including Corfman.