recovering zombie process

[pizomer@xxxxxxxxxxxxx]

I have the following problem. I crashed an mrxvt session 
with 8 or more shells. Now all of them are zombie

ps wax | grep  zsh  show :
 5138 tty3     Ss+    0:00 -zsh
 5269 pts/1    Ss     0:00 zsh
 5290 pts/2    Ss     0:00 zsh
 5314 pts/3    Ss+    0:00 zsh
 6032 pts/0    Ss     0:00 zsh
 6755 pts/6    Ss+    0:03 -zsh
 7588 pts/7    Ss+    0:01 -zsh
 1961 pts/10   S+     0:00 -zsh
 2434 pts/11   Ss+    0:01 -zsh
 4659 pts/13   Ss     0:00 zsh
 8568 pts/15   Ss+    0:00 zsh
29073 pts/16   Ss     0:00 -zsh
23181 pts/17   Ss+    0:00 -zsh
16833 pts/9    Ss+    0:00 -zsh
17134 pts/8    S+     0:00 -zsh
17758 pts/5    Ss+    0:00 -zsh
17851 pts/14   Ss     0:00 -zsh

The question is if someone know a way to recover them.
Maybe something like in reverse of clone.

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