If the I-130 is approved before their death, you may still proceed using “widow(er)” provisions if you married the petitioner and file within 2 years after their death.

If the petition was pending and not yet approved, you might qualify for Section 204(l) protection if you had a bona fide marriage and USCIS knew of the petition before death.

In cases without a qualifying marriage, relief is limited; you might seek other family-based routes (e.g., if another immediate relative can sponsor you).