What kind of bird is this?
The body shape does seem to indicate it's some kind of heron/egret (12 species, of which, have been previously found in Michigan [according to Wikipedia]). 

The seemingly large size from your picture (please edit with actual or best approximation of size), the tufted feathers on the head, white face, and the start of a black line on the anterior edge of the eye all suggest that this could be a great blue heron.

Great blue herons are typically grey (not the dark almost black of your specimen), but I did find some photos with nestlings /fledglings with darker plumage, including below:



 Source: Wikipedia