Who Can claim a life insurance policy?

My mother recently passed away. Unfortunately my father is extremely shady. The were divorced over 12 years ago. I am worried that there may be a life insurance policy showing him as the Beneficiary. How can I go about finding out if there is one and if so who is named on it? My father is the last one I want to benefit from her death. Especially after putting her through so much when she was still alive.