On his website, Nigel Watts, catsparadise@hotmail.com writes

I am so sorry to hear about Cindy. She was a kitten who did not get to live a
full life.  I am a supporter of having cats indoors.  You have 10 cats...all
beautiful.  Don't you think Baylee, Brucie, Jake, Tiggy, Holly, BFC, Baby,
Charlie, Luce and Kiwi deserve to be safe and happy, too?  Whatever the cause
of Cindy's death - ingesting/drinking a poisonous substance, wild animals/dogs,
contact with a car, or something else, it could be used as a learning
experience...a sad experience....NOT to have any more tragic deaths.  Please
consider the indoor only option.