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](https://en.wikipedia.org/wiki/List_of_birds_of_Michigan#Bitterns,_herons,_and_egrets)]). 

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:

[![enter image description here][1]][1]

<sup> Source: [Wikipedia](https://en.wikipedia.org/wiki/File:Ardea_herodias_at_the_nest_11.jpg) </sup>


  [1]: https://i.sstatic.net/ivsW9.jpg