Don (Invasion)

Don came into the ER after accidentally cutting his palm while stabbing his daughter's boyfriend.

History
Don came into the ER after stabbing his daughter's much-older boyfriend. Don accidentally cut his palm with the knife and needed stitches. While he was in the ER, he grabbed a hammer and tried to attack Frank a second time, but was stopped when Jackson Avery tackled him.

Familial
His daughter, Jeanie, is dating a much-older man, something he disapproves of.