Rabbi Yosef Hayyim of Baghdad in his book Ben Yehoyada (Meg. 7b s.v. Rabba) asserts that there was no need to redo kiddushin (their marriages were not terminated) and goes on to answer the (related) question raised by early authorities whether or not R. Zera (see Meg. 7b) needed to remarry his wife after he was brought back to life. (For the "why not?" see next paragraph.)
Regarding ritual impurity, the same query is discussed by many poskim in a couple of other cases (e.g. Elijah and the Shunamite) and the consensus seems to be that only when still a corpse would the question be valid but not once the subject was brought back to life. Even then, many opine that in such a case of supernatural death standard halachot wouldn't apply.
For a lengthy discussion of both these questions, not specifically pertaining to OP's example, see R. Pinchas Zabihi in Ateret Paz (Vol. 1 Part 3 - Even HaEzer no. 9).