Can rigor set in before death?

Yes, although, everything I've read says NO. But my father died in my home and rigormortis set in prior to his death. Approximately 2 hours before death. My father was still alive, breathing, heart beat, pulse and his neck and head were totally stiff. I have yet to find any medical answers to back this up but witnessing it was real..He was completely stiff within 30 min of death. He died from bladder cancer..He did have alot of bleeding weeks prior to death which would mean he had lost a lot of blood. Not sure if that had anything to do with the early onset of rigormortis or not.