On November 15, 2012, he was arrested in Oakland, California on charges of suspicion of assault with a deadly weapon for allegedly beating an 18-year-old Berkeley, California man with a bottle aboard Williams' tour bus.An attendee of Williams' aborted November 16, 2012 performance at the Oracle Arena in Oakland filed a class action lawsuit days after the event, seeking compensation for himself and "all others who paid money for a show and got nothing but Katt Williams' nonperformance." On December 2, 2012, he was arrested in Seattle after he allegedly got into a dispute at a bar in South Lake Union.Williams offered no apology for his remarks during the performance, stating "I don't think I need to apologize for being pro-American." Two live performances in November 2012 ended early because of Williams' confrontational behavior.

He was also the roastmaster of the Comedy Central Roast of Flavor Flav.

He has also used the Money Mike stage name when rapping for songs by such artists as Baby Bash, The Game, and Suga Free.

On November 19, 2013 Williams & Hell Rell released a diss song to Atlanta rapper Trinidad James entitled "Lames In The Game" due to comments made by the rapper about the state of current Hip Hop music.

On August 27, 2011, his performance at the Celebrity Theatre in Phoenix, Arizona was marred by an incident during which Williams responded to a heckler, identified as being of Mexican descent, with an angry tirade that included Williams shouting "..if you love Mexico, bitch, get the fuck over there!

(This was taken with the camera hand-held as I didn't want to carry the tripod around the gardens.)Apparently, the large brown, chestnut-like seeds of this plant were a food source for the Aboriginal people.

The seeds received elaborate treatment before being eaten.His second & first HBO stand-up special was 2006's The Pimp Chronicles, Pt.1, with his comedy piece "This Shit Right Here Nigga, This Shit Right Here Nigga".This is what it is about." Williams also appeared in the official music video for Wild 'n Out colleague Nick Cannon's single 'Gigolo' in 2003.In 2007, he provided the voice of A Pimp Named Slickback in The Boondocks; he plays himself as an on-stage stand-up comedian in Grand Theft Auto IV performing several routines, including an abbreviated version of one of his routines from Katt Williams: American Hustle; and Williams has appeared in several episodes of My Wife and Kids as character Bobby Shaw.This is probably going to go down as one of my finest works, just because it's a collection of forbidden topics that we can't seem to get answered. Part of my guarantee in my ticket price is that I'm going to be talking about what we are talking about now, and discussing from now to the next time we see [me] again.