Language: Obscurity
At first glance, this news story is about a father who is going to be stabbed to death in a bar at some future date. If true, the journalist who reported it needs to be brought in by the police for questioning, some laws of physics need to be reevaluated, or it is an awfully lucky guess.
But we soon work out the most likely explanation, and mentally add the hyphens that are missing between the first three words. This changes it from a fantastical story to one about an expectant father who has already been killed.
The need for this mental adjustment tells us that both the journalist and the editor could have paid a bit more attention to their style guides. Even with the liberal interpretations of English that newspapers take with their headlines, the meaning here is too obscure. It can be assumed, but it should not have to be.
Communication can fail as much from stylistic mistakes as it can from typos and errors in grammar.
Unless it is part of their job, people seldom pay attention to things like hyphens. But using them can prevent the initial confusion of stories like this.