My rose of Sharon trees were fine last year and this year they didn't get any leaves or buds or anything.
My Rose of Sharon Trees
Certified GKH Gardening Expert
If you bend the branches of your shrub do they break and snap or bend?
If they break off, they are likely dead.
You also can scratch the bark, if you see green underneath, there is likely still life in the plant.
With the long harsh winter that nearly the entire the United States suffered this past winter, and your Michigan location, it would not be an unexpected loss of a plant.
You can prune back the plant and see if you get any growth from the shrub next spring.