The actor was being followed by a (mentally) 'deranged' fan.
a 'deranged' mind
(..) And what they'll do to you and how they'll do it. How many years have I had to listen to this? The filth, deranged and twisted and just ignorant enough to be serious. If I ask you something, will you answer me with the truth? Yes. Good, because I am not a fool. (..)2014 Selma
(..) What if she just lost her mind? What if she just needs a doctor? What? A doctor? My Mom died in a mental hospital, she was crazy. She was deranged, she was a monster. I've always feared that me and Mia would end up like her. You're just a fucking coward. You know exactly (..)2013 Evil Dead
(..) Hard times when we thought we wouldn't make it. And like many of you know, marriage isn't always the smoothest road. And it took the actions of a deranged young man to remind me how important Francis is to me. And now, with my mother gone... he's the only family I have left. (..)2016 TvShow: House of Cards Title: Chapter 49 Season: 4 Episode 10