Please help me that can I get our immigration visa back
Correct. Here is from the USCIS website: n the past, a petition could not be approved if the petitioner died while the petition remained pending.  In 2009, Congress addressed this scenario with a new statutory provision, INA 204(l).  This provision gave aliens the ability to seek an immigration benefit through a deceased qualifying relative in certain circumstances.
An officer may approve an adjustment application, certain petitions, and related applications adjudicated on or after October 28, 2009,  if:
The applicant resided in the United States when the qualifying relative died;
The applicant continues to reside in the United States on the date of the decision on the pending application; and
The applicant is at least one of the following:
A beneficiary of a pending or approved immediate relative immigrant visa petition;
A beneficiary of a pending or approved family-based immigrant visa petition, including both the principal beneficiary and any derivative beneficiaries;
Any derivative beneficiary of a pending or approved employment-based immigrant visa petition;
The beneficiary of a pending or approved Refugee/Asylee Relative Petition (Form I-730);
An alien admitted as a derivative T or U nonimmigrant; or
A derivative asylee. 
This applies to an adjustment of status application adjudicated on or after October 28, 2009, even if the qualifying relative died before October 28, 2009. If a petition or application was denied on or after October 28, 2009, without considering the effect of INA 204(l), and INA 204(l) could have permitted approval, USCIS must, on its own motion, reopen the case for a new decision in light of this new law.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.
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