I see that human remains have been found in the search for Sarah Everard, a serving police officer is currently being questioned but should he have been named before he has been charged, some newspapers even published his photo. SKY news last night refused to name him. He may well be guilty but at the moment he is innocent. ???
Why the question marks? That almost implies you believe he is guilty.
I am not a legal expert but my understanding is that everyone is assumed innocent until they are proven guilty. The remains at time of writing have not been confirmed as the missing woman, although it appears that it may well be her.
When a Policeman arrests you they use the form of words " I am arresting you on suspicion of... " and then follows the crime that the officer believes the suspect MAY have committed. In a court the Police need enough evidence to prosecute and then it is for the judge, and jury if there is one, to decide.
However, it's not looking good for the family of Sarah Everard, and the Policeman arrested on suspicion of murder is looking like a guilty suspect. Evidence and forensics should confirm one way or the other.