wife of armed subject

No. Her husband was the armed subject. The person in question who was armed.

"wife of armed the subject" doesn't even make sense.

Now if the wife was the one who gave her husband a weapon, you could say "wife WHO armed the subject" But I don't see where that happened.

Sorry. I meant Should "wife of armed subject" be "wife of the armed subject"?

The wrong place of "the" is appaling to myself too. I'd never imagined I would have made such a naive mistake of grammar.

Now please answer my question as it remains as it is.

It doesn't make any difference grammatically, but to me the addition of "the" sounds better.

Thank you.

The use of "advise": the reportee who advised her husband was armed.

The word "advised" sounds very formal. But it sounds too formal to be very proper to me. Do you think the use of "advised", rather than simply "told", is proper in English?

Since this is a serious matter, involving the police and someone who would be considered dangerous, I think using formal language is appropriate.

When you read about police investigations in the news, they generally use more formal language in order to be specific and professional.