Q.Are my succulents dying? And how do I save them?
This succulent came from my wedding bouquet and my florist said that I could plant them with the wire in from the bouquet. They were doing well for several months, but I can’t tell if they are dying. I know the brown/ reddish stems are probably dead, but don’t want to pick them off if there is something else I should be doing?
Thanks!

Yes, the dark leaves are dead and can be removed.
I'm a bit concerned by the container that I can see in the image.
It appears to be glass; does this have a drainage hole?
I suspect they are just too wet and that is causing the succulents to suffer root rot.
These articles will help you with care.
https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/care-for-potted-succulent-plants.htm
https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/watering-succulent-plants.htm