According to TMZ, Michael Nunn tweeted threats to the LA Ink star earlier in June. He reportedly wrote on June 4, "You have to understand, Kat, my life is over because of you. Therefore, what would my only reason for living be? Revenge."
Nunn went on to say he wants people to feel guilt for what he's "about to initiate in a few weeks," and threatens to "go Columbine in Los Angeles." He tells Kat to "get it through your [expletive] head!! Lose the game or watch people die!" and, "Your [sic] running out of time and I'm not running out of anger and determination."
Kat Von D previously filed a restraining order against Nunn for unwanted phone calls and visits in 2012. Los Angeles police have been unable to locate the man thus far, but have a search warrant and are scouring his Twitter for clues.
Notable deaths of 2014 [PHOTOS]