Apperson’s arrest record says he has been dealing with mental health issues, with a police officer saying:
During the investigation, I learned that Apperson has exhibited unusual behavior in which he had recently been admitted to a mental institution. It appears that Apperson has a fixation on Zimmerman and has displayed some signs of paranoia, anxiety, and bipolar disorder.
There wasn’t much explanation of Mr. Apperson’s conduct that made sense, the way that Mr. Zimmerman described. If he [Apperson] does have some mental issues I think that might very well go a long way in explaining what was otherwise very bizarre yet very violent behavior.