Apprehension: the act of capturing or seizing; arrest The apprehension of the killer only took the police four days. Apprehension of the killer was a top priority for the police. The killer did everything he could to avoid apprehension by the police.

We wouldn’t use apprehension this way. As a verb apprehend means to catch, but it’s meaning changes as a noun to mean fear. For example, I have a lot of apprehension about the test. To change your sentence to use a noun, I would recommend: The police have finally put the killer in prison.