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Three men, aged 21, 40 and 41 have now been arrested and are due to appear at Airdrie Sheriff Court on Tuesday.

Demi Hannaway, from Airdrie, died in May 2021 after being the subject of physical and mental abuse at the hands of Andrew Brown.

Brown, 33, was jailed for three years and seven months at Airdrie Sheriff Court last May after admitting threatening and abusive behaviour.

Another architect named in the letter was James Davidson, who was born in Airdrie in 1848, the son of a weaver.

He was educated at Airdrie Academy and initially trained as a joiner but later became an architect.