Hello and welcome to the forum. Some more information would really be helpful. Was this a plant that was kept inside year round, or perhaps just in winter? Do you know the species? What I'm trying to determine is if the plant is simply in a dormant phase or in real distress.
One way to tell if there is any life left is to make a small nick in the bark and look for green tissue. Otherwise just wait for while and make sure not to water too often, a tree without leaves won't require as much water as a similar, healthy specimen.
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