Missing vet Catherine Gowing's burned-out car has been found close to her home in New Brighton, Flintshire.
It was found at about 7.15pm on Thursday after a member of the public contacted police.
A 46-year-old man from Gwynedd remains in police custody after being arrested on suspicion of her murder on Tuesday night.
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The tweet said: "Our lionesses go back to being mothers, partners and daughters today, but they have taken on another title - heroes."
The BBC has agreed to pay for TV licences for viewers over the age of 75, the Culture Secretary John Whittingdale has confirmed.
The British Army's first ever female major general said she is "very honoured" by her new role.