Am i a life insurance beneficiary?

my cousin Keith Barnette Grimes died April 1st 2011 he got sick from guardia parasite infestation which was shutting his organs down after several emergency room visits and being sent home with no answers he decided to end his suffering with a gunshot to the head. He told me I was a beneficiary and to give him my mailing address for the beneficiary check to be mailed. he is retired postal carrier ss# 417-90-3326. does he have me as a beneficiary? My name is Robert Reymundo dob 02-17-1967, ss# 418-15-1418