How do I kill orphan processes?

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I wrote this today to kill orphan processes left by my very dirty chk_servs.ksh script that runs constantly in a VNC session using ssh-agent to ensure encrypted traffic. These orphaned procs were eating up my CPU.

# This script kills orphan processes for a particular user
if [[ $# < 1 || $# > 1 ]];then
        echo "Syntax : kill_orphans.ksh"
        exit 1
fi
 
user=$1
 
cat /etc/passwd | awk -F : '{print $1}' | grep $user >/dev/null
rc=$?
if [[ $rc > 0 ]];then
        echo "$user is not a valid user."
        exit 2
fi
 
ps -fu $user | awk '{print $3,$2}' | while read ppid pid
do
if [[ $ppid -eq 1 ]];then
        echo "Killing orphan process $pid..."
        kill $pid
fi
done
 
exit 0
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