Among the claims within the lawsuit was that Brooks had groped her in a "sexual manner" while she was unconscious.
Brooks faces up to six months in prison for the alleged incident that took place on the same night and involved the same woman as in the McDonald charge.
A written statement from 49ers general manager Trent Baalke said:
"The organization is aware that a misdemeanor charge has been filed against Ahmad Brooks stemming from a December 2014 matter. We take any charge against a member of this organization seriously and are in communication with the NFL. Ahmad is returning home to California and will not participate in Saturday's game."
That game will be against the Denver Broncos. The 49ers are in Denver right now holding joint practices with the Broncos.
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