What psychological factors may mitigate death penalty sentencing?

Respectfully, you provide no facts pertaining to a pending criminal case, and given the broad nature of your inquiry it appears to be a homework assignment rather then a legitimate inquiry about a current legal issue. If I am wrong, please consider reposting with enough facts that we can assess the inquiry against the facts you provide. If I am right, and this is a homework question, I am certain your teacher would want you to do your own research as that is part of the learning process. Good luck.

DISCLAIMER I do not practice law in your State. This answer is provided solely for informational purposes only. This answer does not constitute legal advice, create an attorney-client relationship, or constitute attorney advertising.