“Rookie” star Afton Williamson abruptly quit the show last week over allegations of sexual harassment and racial discrimination against cast and crew. Williamson, 34, explained her decision in a lengthy Instagram post.

In her post she accused the head of the show’s hair department of “Racial Discrimination/Racially Charged inappropriate comments.” She also accused the show’s executive producers of bullying her on set after she complained.

Additionally, Williamson accused showrunner Alexi Hawley of not passing on her complaints to human resources, and she claimed the head of the hair department was only fired after a “sexual assault incident” that occurred at the show’s wrap party.

Williamson, who wears wigs on the show, had a series of run ins with the hair department staff.

The actress also accused an unidentified guest star of sexual harassment and said she was required to film scenes with him even after she filed complaints about his sexually aggressive behavior.

“After my initial report of sexual harassment, I was assured that the actor would be fired,” she wrote. “This actor reappeared on our call sheet at the end of the season, I was even written in scenes with him.”

Entertainment One was quick to issue a statement and promised to launch an investigation into the allegations. “The safety of working environments is a top priority for us, and we take this matter very seriously,” the statement reads in part. “We have initiated an independent investigation which is ongoing and as such, it would not be appropriate to comment at this time.”

But insiders whisper that ABC bosses have their doubts about her story.

ABC Entertainment president Karey Burke is scheduled to speak with reporters on Monday during the Television Critics Association’s summer press tour, TheWrap.com reports.

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I will not be returning for Season 2 of The Rookie. I owe it to you my amazing fans to share the Truth. Throughout the filming of the pilot, I experienced Racial Discrimination/Racially Charged inappropriate comments from the hair department and bullying from Executive Producers. During the Season, it continued along with Sexual Harassment from a recurring guest star and the racist commentary & bullying from the Hair Dept. Head escalated into Sexual Assault at our Wrap party.The Sexual Harassment though reported directly to the Showrunner/EP remained undocumented and was not reported to HR as promised. The Hair Dept. Head was fired ONLY after the sexual assault and NOT for an entire year of outward racism/racially charged language and bullying behavior in and out of the Hair and Makeup trailer. HR protocol was never adhered to following the above reports given by me to my Showrunner/EP and an investigation was never issued for any of my claims. The only time I was asked to participate in an investigation was after a meeting I called in June following our Season 2 announcement. This meeting included the Showrunner and two other producers as well as my agent and SAG-AFTRA Union Rep. It was clear to all present in the meeting that the Showrunner had not shared my reports with the any of the producers. After my initial report of sexual harassment, I was assured that the actor would be fired. I was also asked to film with him the very next day as a courtesy to the script, even though we had not begun filming the episode yet. This actor reappeared on our call sheet at the end of the season, I was even written in scenes with him. I asked the Showrunner about this and he admitted to me that the actor had not been fired nor had he gotten HR involved. I was asked to return this season, and promised that “everything was handled.” The investigation hadn’t even begun and Season 2 had already started filming. I turned it down and I walked. Now is the best time in the world to be a woman and I have a platform so it’s time to use my Voice. Strength comes from within. It comes from Above. “Greater is He that is within Me than he that is in the world” ????

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Photos by Dan Jackman/WENN.com, Joseph Marzullo/WENN.com