Is a wife required to observe the legal waiting period (iddah) if her husband is martyred?

If the husband dies, whether a martyr or not, the wife must observe an 'iddah (waiting period) of four months and ten days if she is not pregnant. If she is pregnant, her 'iddah ends immediately upon delivery. It is not permissible to definitively declare anyone a martyr except by a legal text. Rather, one should say, "We hope he is a martyr" or "We consider him a martyr," as in the hadith of Umar, may Allah be pleased with him.