Am I required to report it on my Tax form 1040-SR?

Am I required to report it on my Tax form 1040-SR?   My husband passed in Feb. 2020. Monies are sitting in a 457(b) Plan & a 457(b) Rollover (Pre-Tax) account because I am not sure what to do?  The account is exactly the way my husband left it except I am the new owner. He was 69 and I was 82 at the time of his passing. We were married 45 years.  Should it be reported?