Welcome to Half-Life Answers. What would you like to know?

in comic he has laid in some sort of relaxation chamber from first Portal, so probably he can be alive

and People think that in "the Fat lady Sings" You can see a shadow moving speculated to to be rattman.

and in his Den you here rambling which could be a ghost or could be him alive?

No one really knows...well expect Valve.

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