The Los Angeles County District Attorney's Office made no comments today on the merits of the accusations.
A man alleged the actor had assaulted him in Hollywood in October 1992.
The Los Angeles Police Department began the investigation when a woman approached the LAPD and claimed she'd been assaulted by the Black-ish star, according to TMZ.
The case remains under review. However, the LA district attorney's office decided not to file charges after she "declined to be interviewed by the investigating officer".
Anderson had been accused of assault by a woman who catered an event he organized, according to reports.
Seagal has denied the accusations against him.
They say any alleged sex crime involving an adult that occurred in 1992 would fall outside of California's statute of limitations. A sexual battery allegation from 2016 in Malibu is still under review by the district attorney.
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Spacey's publicist in November said the two-time Oscar victor, who has been accused of sexual misconduct by more than a dozen men and boys, was "taking the time necessary to seek evaluation and treatment".
The Anderson case, which was investigated by the Los Angeles Police, involved a woman who claimed he assaulted her earlier this year.
In the case of Seagal, the allegation of assault is from 1993, when the victim was 18 years old.
The two-time Oscar victor has been accused of sexual misconduct by at least 15 men, with alleged incidents spanning his decades in film and on the stage.
After Rapp made his allegation, Spacey issued a statement saying he did not remember the encounter but apologised for "deeply inappropriate drunken behaviour".
Actor Kevin Spacey speaks with the media at the premiere of Netflix's television series "House of Cards" at Alice Tully Hall in the Lincoln Center in New York City January 30, 2013. Ridley Scott also removed Spacey from his role in All the Money in the World and reshot parts of the film with Christopher Plummer as a replacement.