Oh I'm so sorry about your Mr. Jack!
I can totally relate...my sweetest ever rooster, Daisy,
was taken by some unknown predator a few weeks ago -
I was at home (talking on the phone with my daughter)
and heard Daisy 'talking' with the girls.
I ignored it for a few minutes until the carrying on
got louder and then I knew something was wrong.
By the time I ran outside, Daisy was gone.....
All the girls were locked in their run - Daisy was
outside the run with his usual freedom.
I've cried buckets and buckets of tears and
beat myself up for not having gone out to check on
him when I first heard a ruckus.
Oh my - so hard when they are more than just chickens.
So sorry again about your sweet Mr. Jack!