Deuteronomy 21:2

then two of the sages shall proceed from the chief court of judgment, and three of thy judges, and shall measure to the surrounding cities which lie on the four quarters from the (spot where) the dead man (is found);

your elders i.e., the elders and judges of the nearby cities.

ומדדו אך הערים, “and they shall measure unto the cities;” Rabbi B’chor Shor said that G–d commanded all these details in order to publicise the fact that an unidentified person had been found murdered so that witnesses who might be able to identify the slain man and to thus prevent his widow from becoming an agunah, a woman who is unable to remarry due to our not knowing if her husband had really died. When our sages in the Talmud tractate Yevamot folio 120, stated that the only valid identification is recognising the carcasses’ face, including his nose, this is meant when the identification is only based on facial features including the nose. When we can hear from the way the witnesses speak about the deceased that he must have been familiar to them, this testimony is definitely sufficient to allow the deceased’s widow to remarry, even if this identification occurred several weeks after the slain person had been found. In fact, even identification from a distance may be sufficient. The example quoted in the Talmud there on folio 121, is that a Rabbi Yehudah ben Baba, performed a wedding ceremony for a woman five days after her husband had drowned and been identified. The Talmud justifies this due to decomposition of a corpse in water taking much longer that decomposition of features on dry land.