Derek Houlston, whose garden backs on to the couple's property, said:
She was bubbly and really friendly. We used to see her walking her dog.
He was always very friendly too but we saw him doing his paper round - which she got him to do to keep fit - on Saturday and he seemed really depressed.
I said hello but he just kept his head down and didn't respond. It's really sad because they seemed like such a lovely couple.
David Stow, who lives nearby, said he heard a single gunshot on Sunday.
We're in the country so we hear a lot of gunshots so at first I didn't think anything of it. But then I saw the police arrive and realised it must be something serious.
I knew them to speak to and they always seemed a very nice couple.
More top news
Big Ben will fall silent on Monday for renovations following a backlash from MPs over the proposed four-year timetable for the work.
Rain will push into the northwest, turning heavy and persistent in places
Thousands of dangerous appliances are still in use across the UK despite years of warnings about the dangers.