The police will soon arrest the murderer.

The murderer will be arrested soon by the police

The murderer will have arrested by the police soon

The murderer arrested by the police

The murderer is to be arrested soon by the police

All of these

Explanation

Passive voice of Future Indefinite Tense

Firstly, change the structure, so the object in active voice becomes the subject in passive voice. Secondly, use the verb 'to be' in the same tense as the main verb in the active voice. Lastly, use the past participle of the main verb.