The reason I'm not happy about taking a Daily Mail link as the truth, the whole truth etc is that long experience tells me it delights in 'making' scandal where one may not exist. It particularly likes doing that where the scandal can be portrayed as a failing by 'the authorities'.
It also plays fast/loose with facts.
A prime example of that was around ten years ago where a section of road accessing a development in Bedfordshire that had a 'No Motor Vehicle Except Buses' restriction was changed to a bus lane. The intention was that the drivers disregarding the restriction could be caught on camera and fined.
Unless you though there was more than met the eye and used Streetview you'd have thought all the people pictured with Penalties and wearing 'compo faces' were properly caught out by something dropped out of a clear sky onto an unrestricted road.
If you Google the girls name you can find a bit more about the case including the fact that the inquest was adjourned last year for the Police to make further inquiries into the Brother's account.
I'm not saying he is not a baddun.. However, unless the Prosecution can get a jury to be so certain they are sure that (a) he actually deliberately punched her and that (b) there was a causal link between the punch and the girl's death then the jury will not be convinced and he'll be acquitted.