On Friday, June 7, Perrette, 50, wrote on Twitter to her fans, "NO I AM NOT COMING BACK! EVER! (Please stop asking?). I am terrified of Harmon and him attacking me. I have nightmares about it."
As Radar exclusively reported, Perrette began feuding with Harmon, 67, when he brought his rescue dog Dave to work after he had bitten a crew member on the set in October 2016. The victim was left with a gash that took 16 stitches to close.
"Mark was obviously horrified and made sure that Dave went through re-training and was frequently checked by his vet," a source told Radar at the time. "Despite this, Mark made the decision to not bring Dave back to the set."
But when Harmon was forced to bring his pooch to work one day because no one could watch him during an 18 to 19-hour shoot, the cast and crew were fine with it. Other than Perrette, that is, according to the soure.
She was allegedly "furious" and "refused to listen to" Harmon when he tried to explain the situation.
"After that Pauley just lost it and started shouting at Mark," the Radar insider claimed. "She said that he should never have adopted a pitbull in the first place."
The source claimed she began to act like "a bit of a diva on set from that point on."
"She refused to shoot scenes with Mark and she refused to sit on the same side of the table as him at table reads. She even completely ignored him any time he tried to make amends."
Perrette announced her departure from NCIS in October 2017.
But as RadarOnline.com readers know, in May 2018, Perrette shared a shocking Twitter statement, claiming she'd suffered "multiple assaults" on the set of the series.
The actress who played Abby Sciuto alleged that she'd been forced to stay silent by a "very rich, very powerful publicity 'machine.' "
Perrette even claimed she was able to leave after fifteen seasons because "nothing is worth your safety."
Soon, CBS fired back, saying they "took the matter seriously" and had "worked with her to find a resolution."
But Perrette is still making allegations against Harmon. And in her June 7 tweet, she added, "I have a new show that is SAFE AND HAPPY! You'll love it! #HappyPlace Love y'all!"
Reps for CBS and Harmon haven't commented.
On Friday, June 7, before her tweet alleging she was terrified of Harmon, Perrette posted pictures of a person, whom she claims was an NCIS crew member, with a bruised eye and stitches.
"You think I didn't expect blow back? You got me wrong. THIS happened To my crew member and I fought like hell to keep it from happening again! To protect my crew!" she wrote alongside the Twitter photos.
She then claimed, "And then I was physically assaulted for saying NO!?and I lost my job."
In a statement from CBS at the time after Perrette quit the show, the network said, "Pauley Perrette had a terrific run on 'NCIS' and we are all going to miss her. Over a year ago, Pauley came to us with a workplace concern. We took the matter seriously and worked with her to find a resolution. We are committed to a safe work environment on all our shows."
Perrette thanked CBS for that, writing back then, "I want to thank my studio and network CBS They have always been so good to me and always had my back."