Mystice user.

["Egor Tur" <worldeb@ukr.net>]

Hi.
What I have:

$ w
 12:04:29 up 85 days,  1:32,  2 users,  load average: 0.00, 0.00, 0.00
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU  WHAT
egor   pts/0    orion.mao.kiev.u 11:38    0.00s  0.16s  0.01s  w
$ who am i
egor   pts/0        Mar 18 11:38 (leo)
$ who
egor   pts/0        Mar 18 11:38 (leo)
egor   pts/7        Jan  2 20:53 (tur:2.0)
$ ps ax | grep pts/7
17783 pts/0    S      0:00 grep pts/7
$

How can I kill this mystic user on pts/7?
Thanx.