If the exact date is not known to you, then you can make use of that social security death index to locate such information.
Ọ bụrụ na ị maghị kpọmkwem ụbọchị ọnwu, ị nwere ike iji Ndepụta Ọnụ Nche Nchebe na ịchọpụta ozi a.