I seem to have a bug with the part where you kill Dr Steinman. I got to this point about a month ago but not played on it since. However looking around i cant find Dr Steinman dead or alive. There is still a barrier across the corridor out of the surgery wing so i am guessing that i dont have the key yet to progress any further. Anyone got any ideas?
my only suggestion for you would be to either load your prior save to where you are stuck and re-do what you can. Or keep searching for the good Doctor. I never ran into this problem so i really can say what will work best.
If i remember correctly you fight with Steinman in his surgical lab, which also has a basement. you may want to check there. Look around though, it wont hurt as long as you don't mind doing it because you will find plenty of stuff and new areas. If you have searched every corner, then I think you are better off just re-loading or re-starting since you are not very far into the game.
I wish I could be more help.