Risling declined to provide more details about the alleged assault or to clarify whether California's 10-year statute of limitations applies in the case.
Santa Monica Police Department investigators presented the case to the L.A. District Attorney's Office on Wednesday, June 13.
"It is under review by our sex crime task force".
Stallone's case joins a slew of others that are being handled by the L.A. County sex crimes task force, which was formed a year ago in the wake of the vast fallout from the Harvey Weinstein scandal.
The first was said to have happened in the 1990s, but it wasn't reported until late past year. The first involves the rape allegation from 1990, and a source close to the investigation said that this is the case being reviewed by prosecutors.
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"No one was ever aware of this story until it was published today, including Mr. Stallone", spokesperson Michelle Bega told The Daily News past year.
Stallone's rep called the Las Vegas allegation "a ridiculous, categorically false story". "At no time was Mr. Stallone ever contacted by authorities or anyone else regarding this matter".
Santa Monica Police started to look into the allegations against Stallone in November.