You are reading the local news ~ always a good way of keeping your language fresh, along with your memories of places and people you met there ~ for a part of Britain where you previously spent some time (maybe as an au-pair in a family, or as a longish-term homestay TEFL student), and which you therefore remember particularly fondly.
To your dismay, there has been a murder in this town or village (quite a small community, and now fairly obviously shocked at what's happened). The report ends by saying:
'A local man in his late twenties is currently helping police with their enquiries'.
What does this tell you?
Someone local has gone along to volunteer to help the detectives, by working alongside them.
The young man is in dialogue with the police because they have strong reason to suspect that he knows about the murder, and may indeed have committed it himself.
The man has been arrested, taken to the police station, and is expected to be charged with the murder.
The man is a civilian forensic specialist working alongside the police, but the media have 'latched onto him' for some other reason because he may tell them more than the police can.