Getting close enough to any of the Knight Sabres is not a problem.  
Sylia must meet with a multitude of people each day, and most of them 
probably get within a yard of her.  If you wanted to use biowarfare, 
that is close enough to use most nerve agents without affecting anyone 
else.  And there are agents that aren't tracable.

You want to stay away from biowarfare?  Fine by me.  Let's try crime.  
Genom could send some Boomers to beat the crap out of Priss, and leave a 
fresh corpse of an Outrider in the same area.  Police would conclude 
that the Outriders attacked her, and she managed to kill one before 
being taken out.  A BU-12 attacks Nene while she is driving her scooter 
to work.

Crime not your scene?  How about technology?  Call up Linna.  When she 
answers the phone, send a high frequency burst of sound.  At the right 
frequency, it ruptures the eardrum and pierces the brain.  Dead in 
seconds.  Two problems with that though.  One, it is kind of messy, as 
blood would have a tendancy to shoot out of ears, and two, it can't be 
written off as natural, or have an easy explination.  Which means that 
you need a clean up crew to dispose of the body, and clean up the blood.

Still not satisfied?  Okay, how about 'natural' disaster?  If you point 
a nine at Sylia and pull the trigger, she's gonna die, naturally.  But 
how do you cover it up?  Damn shame that Lady633 had that problem with 
it's gas main.  Could only tell that it was the owner's body by the 
dental records.

It's scary how easy it is to kill people and get away with it.

-- 
JD
Paladin of the Holy Pair
Verbena Mage
No-Brand Hero

Kiss me, Wind, kiss me... 
Hold me, Sky, hold me tight... 
And protect us, always, 
until we overcome and break down the walls, 
until we touch down and seize our dreams, 
because we were born 
to be happy. 

-Asu e Touchdown