Or write a chapter using third person and shift to first in the next. Rosellen Brown wrote a novel about a young man who molested and murdered his girlfriend in Before and After. She arranged the book in four sections, with different viewpoints. The reviews on Amazon were mixed and mostly negative. (Part of the mixed reactions may have been because of the theme.)
In which genre are you writing? Examine books by authors who write in the same field. Familiarize yourself with their POVs.
It's easier to sell books written in the usual POVs.