a retired managing director at the ` end of his tether ' over his wife 's alzheimer 's and plans for a traveller camp near their home shot her dead before killing himself .
mr knott was said to be fighting plans to build a gipsy camp in a paddock -lrb- outlined in red -rrb- close to their 300-year-old cottage - the second traveller site proposed close to their home in two years .