Could you confirm whether the following sentences sound natural? Thank you in advance.
1. It's her who killed her husband.
2. It's you (who) he has a crush on!
* ( ) means the relative pronoun 'who' in the brackets can be dropped.
[1] It's her who killed her husband. [2] It's you ( who) he has a crush on! [1] is fine.
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[1] It's her who killed her husband.
[2] It's you (who) he has a crush on!
[1] is fine. You are right to use accusative "her" -- nominative "she" is also possible, but less likely in everyday language. The relative pronoun "who" is the subject of the relative clause and hence is obligatory.
[2] is als