Died Without Sin

Who are the four people who died because of the Garden of Eden snake?

The Talmud, Shabbat 55b. states in the name of Rav Ami that there is no death without sin and no distress without iniquity...There are four who died as a result of the snake's enticement [in the garden of Eden] but they personally had no sins - Binyamin, the son of Yaacov; Amram, the father of Moshe; Yishai, the father of David; and Cal'ev, the son of David.