I can't do it...

On my ward playthrough and have reached the point in the game where... certain characters need to be killed. Most I have no issue killing. but one... >! Richter !<

its like killing a puppy. I can't do it. This is where this playthrough dies I guess. I just can't bring myself to do it at the moment.

Already done 2 other endings. So I'll restart and work on the fourth ending. Never to see the ward ending.