An inquest is due to resume today into the deaths of an elderly couple at their home in Kendal.
It's thought 92 year old Stanley Wilson stabbed his 89 year old wife Peggy before taking his own life.
The inquest has heard from mental heallth professionals who said Mr Wilson had wrongly believed his wife was trying to poison him.
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Sandy Murray, of Police Scotland, was was giving evidence at the trial of a bus driver who denies killing Ryan Baird by dangerous driving.
34-year-old Christopher Peck was involved in a head-on crash with a drunk driver. His funeral has taken place in his hometown, Workington.
The arrests come weeks after a much-publicised series of appeals to mark the 30th anniversary of the 18-year-old's death.