Kat Von D is dealing with some seriously scary threats from a man online who has pledged to "go Columbine in Los Angeles,” TMZ reports.

The gossip site reports the LAPD are trying to locate Michael Nunn, a man from Iowa who says the famed tattoo artist ruined his life and he is seeking revenge.

Video: Nunn reaches out to Kat Von D

Back in 2012, Von D got a restraining order against Nunn after he harassed her by calling her and showing up at her home and work.

Most recently, on June 4, he tweeted "You have to understand, Kat, my life is over because of you. Therefore, what would my only reason for living be? Revenge."

He also tweeted that people will feel guilt for "what I'm about to initiate in a few weeks" adding to the reality star, "Your [sic] running out of time and I'm not running out of anger and determination."

Police told TMZ they are have been unable to locate Dunn thus far but have acquired a search warrant to view his Twitter account and are hoping that sheds some light on his whereabouts.