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Stewart, 61, killed the 51-year-old children's book author in 2016 and dumped her body in the cesspit of the £1.5 million home they shared in Royston in Hertfordshire.
Ian Stewart, 61, killed the 51-year-old children's book author in 2016 and dumped her body in the cesspit of the £1.5 million home they shared in Royston in Hertfordshire, along with her dog Boris.
Second conviction came after tests conducted on brain that had been donated to science
The family of Diane Stewart has described her as a "special and caring person".
A 61-year-old man will spend the rest of his life in prison after being found guilty of murdering his wife in 2010, six years before he went on to kill his fiancee at their home in Hertfordshire.