involuntarily disconnected screen session thinks it is already attached

[Poor Yorick]

using

        Screen version 3.09.15 (FAU) 13-Mar-03

Sometimes when my network connection is involuntarily terminated, I 
re-establish the connection, obtain a new IP address, telnet to the host, and 
attempt to reattach the screen session:

        screen -rd

which then hangs indefinitely.  The '-D' switch also hangs.  screen -ls shows 
that screen thinks the session is still attached to a previous pts:

        26770.pts-6.myhost     (Attached)

Is there any way to tell screen to detach that session?

-- 
Poor Yorick