<prompt> All are true regarding muscular changes after death except -Rigor mois occurs 1-2 hours after the deathCadaveric spasm involves involuntary musclesRigor mois involves voluntary musclesRigor mois involves involuntary muscles  <response>: Cadaveric spasm involves a single group of voluntary muscles. Dr. Narayana Reddys Synopsis of Forensic Medicine Toxicology 27 th edition pg. 81. 