Can a “who” act as both a pronoun and a conjunction at the same time?

Question

Example:

I will sue the person who murdered my neighbour.

In the above example, should we treat who as a relative pronoun, a conjunction, or both?

Answer 1

It’s a relative pronoun, and nothing else.

Answer 2

Who identifies the person you will sue as the subject of the verb in the relative clause, murdered. A conjunction cannot do that. A pronoun can. A conjunction simply connects two separate clauses.

A relative pronoun is a pronoun used to mark a relative clause, and having the same referent as the element of the main clause (usually a noun or noun phrase) which the relative clause modifies.

You will notice that dictionaries don't have an entry on who as a conjunction.