Actor Armie Hammer will not face charges following an investigation by Los Angeles police into an allegation of sexual assault against the actor, the LA District Attorney's Office told CNN on Wednesday.

"Sexual assault cases are often difficult to prove, which is why we assign our most experienced prosecutors to review them. In this case, those prosecutors conducted an extremely thorough review, but determined that at this time, there is insufficient evidence to charge Mr. Hammer with a crime," Tiffiny Blacknell, Director of the Bureau of Communications told CNN.

"As prosecutors, we have an ethical responsibility to only charge cases that we can prove beyond a reasonable doubt. We know that it is hard for women to report sexual assault. Even when we cannot move forward with a prosecution, our victim service representatives will be available to those who seek our victim support services. Due to the complexity of the relationship and inability to prove a non-consensual, forcible sexual encounter we are unable to prove the case beyond a reasonable doubt."

CNN has reached out to representatives of Hammer for comment.

The LAPD opened an investigation into the matter in February 2021, after a woman, identified by her attorney at the time as Effie, accused him of raping her in 2017.

Hammer was not charged in the case and has denied any wrongdoing, at the time saying through his attorney that the allegation was "outrageous" and that his interactions with the woman and other partners have been "completely consensual, discussed and agreed upon in advance, and mutually participatory."

CNN reported last month that the Los Angeles District Attorney's Office was reviewing claims of sexual assault made against the actor. They did not specify the identity of the complainant or complainants.

In a statement made on Wednesday to CNN following the DA's decision, Effie said in part, "I am disappointed with the LA County District Attorney's decision not to prosecute Armie Hammer. I felt a duty to speak out and file a report in order to try to hold Armie accountable for all the harm and trauma he has caused me and in order to protect other women from experiencing similar abuse."