The embattled actor previously pled not guilty to nine charges, including multiple counts of sexual assault.
Spacey was accused of assaulting four men between 2001 and 2013 while living in London.
The latter carries a maximum sentence of life imprisonment.

Kevin Spacey.Credit: Rasid Necati Aslim/Anadolu Agency via Getty Images
Due to a legal technicality, the indecent assault charges were later dropped.
Spacey maintained his innocence from the outset, denying all of the charges.
The fourth encounter he denied entirely.
John and Furnish testified that Spacey only attended the event in 2001.
The case was formally dismissed.
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