Is my cherry tree dead?

Last autumn I bought two young trees but now the cherry looks dead. The apple aree looks healthy with lots of leaves and new shoots coming but the cherry has recently seemed very sick. The leaves have shriveled up and fallen off. Is it dead or can I revive it? What should I do? It was bought from JParkers and I've already had a refund from a hawthorn that just failed to thrive! I'm starting to wish I'd never bought from them now! 


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I've never had a lot of luck with JParkers trees - can't beat them on their bulbs though.
I've always found them great in terms of refunding or replacing though - never any hassle.
https://www.rhs.org.uk/advice/profile?PID=809