Speaking after the verdict, Una's niece, Julia Green, said: "In 2013 we heard our Auntie Una had passed away.
Newton almost got away with the 2013 slaughter after police initially believed Una had died in a tragic accident.
David Newton spun an evil web of lies to evade justice after knifing 86-year-old Una Crown in the neck and chest.
The horror unfolded on January 13, 2013, when Una was discovered in a pool of blood by family members at her bungalow in Wisbech, Cambridgeshire.
The retired kitchen fitter had been seen drunkenly walking from the direction of Una's home at about 8.30pm on January 13.
