Stephen Jefferies, 74, wife Christine, 72, and their dog, May, were found dead at the family home in the Trowbridge area of Cardiff on October 5 last year.
It's thought the thief could sell the covers for scrap.
Martin was found guilty by a jury at Brighton Law Courts after five and a half hours of deliberation.
Mosquera 'decapitated and dismembered' them, froze parts of their remains and took the rest in suitcases to Clifton Suspension Bridge in Bristol.
More high street store closures are due next month in the lead up to Christmas
Resident doctors will go on strike in November following disputes around pay and job shortages.
The latest from Alright Gov.
The 41-year-old appeared in court the same day the man died in hospital.
More than 3,900 companies saw their apps or websites be knocked off.
This is what happened when a Londoner confronted his bike thief.
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