finding the procpid (or pid) for a prepared transaction

Hi All;

I have several prepared tx which are running for a long long time. I
want to kill 'em but I dont know the process id. I can get the xid via
pg_prepared_xacts.transaction however the tx's have no locks thus no
corresponding pg_locks row.  Anyone know how I can get a procpid based
on a tx id?


Thanks in advance...