As’salaam Walaikum,
الجواب وبالله التوفيق
In order to perform Shar‘ai Halalah the woman will have to marry another man after completing her period of ‘iddah without the intention or putting forth any condition to get a divorce from him.
After the consummation, if this marriage ends through divorce or the death of the husband then after the completion of the period of ‘iddah, she can marry her first husband again.
واللہ اعلم بالصواب
