Legal documents obtained by TMZ claim Walton invited Tennant to his hotel room to discuss a book she was writing in which she wanted him to write the foreword, but he became aggressive and pinned her to the bed.
It added the lawsuit says he eventually stopped and let her go but, as she walked away, grabbed her from behind and pulled her close - before eventually allowing her to leave.
"We are aware of the report and are gathering additional information", the statement read. "We have no further comment at this time".
Tennant left Spectrum Sportsnet LA in later that year and reportedly shut down her social media accounts for months.
It should be noted that a previous version of TMZ's report indicated the alleged assault occurred in May 2017.
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Walton got the job as the head coach of the Lakers after serving as an assistant coach for the Warriors under Steve Kerr.
Tennant says she had a longstanding business relationship with Walton, according to TMZ.
The Warriors also released a statement, saying they only learned of the allegation on Monday and are seeking more information.
The paper said it reached out to Walton, his new team the Sacramento Kings and Spectrum SportsNet and did not get an immediate response. If it had been, we would have immediately commenced an investigation and notified the National Basketball Association.