"Has it actually been confirmed then?"
The person arrested is to appear in court this morning, and I think that's when he is formally named to the public.
But all the major news channels are running with 'widely believed to be Michael Stirling, the 32 yo BIL of her ex' so there's an authoritative early version circulating somehow. That it is 32 yo male was formally confirmed at time of arrest, just the name that has yet to be officially confirmed.