Sopranos "Kennedy and Heidi" 6.18

Signs that there's no turning back for Tony:

murder of Christoper (who drowns in blood)
trip to Vegas had a hell/voodoo quality
the ducks (Tony's symbol of escape) were in the pond where they were dumping the asbestos

The "Kennedy" fleeing from the scene a car accident is a pretentiously named teenage girl.

Lyrics for Comfortably Numb:

There is no pain, you are receding.
A distant ship's smoke on the horizon.
You are only coming through in waves.
Your lips move but I can't hear what you say.

When I was a child I caught a fleeting glimpse,
Out of the corner of my eye.
I turned to look but it was gone.
I cannot put my finger on it now.
The child is grown, the dream is gone.

I have become comfortably numb.