Here are the 99 out of the top 100 players ranked by kills per root game (jurgen not counted since he didn't have any regular games for the month):

15.30 spanky6
12.29 Marlon Castillo
12.21 michele
11.38 davilfs
11.26 mar101
10.58 toms
10.49 barry gateaux
10.41 Brennwert
10.38 g00b1
10.31 ahnbohwan
10.22 Beach_Bum_13
10.05 hahakaka6
9.97 BugThug
9.94 DJCrowther
9.62 Sace
9.52 Darek Szewczyk
9.30 Jouster III
8.87 the die
8.50 Hong Kong
8.29 Vertiglug
7.94 TheGrunt
7.85 OneShot7
7.69 vas
7.52 arkenkor
7.30 Qaziyev
7.23 Indianer Jones
7.13 isaaktas
6.87 Sensei_Mata
6.59 RandyRandy
6.55 peter luftig
6.26 hcdug
6.15 niczrobo
6.15 Fatman_x
5.97 si82
5.89 lipos
5.79 iDu
5.68 Marcysch
5.61 Lucas Barbosa de
5.51 ChalkdustTorture
5.40 Rebel9
5.40 Donald Krunk
5.32 madlamb
5.17 IFIGENIUS
5.15 BenJa LeZana
5.10 Louis Cypher
5.03 djefferson
5.01 Slinus
4.95 tyla
4.88 zin8
4.87 john_egg
4.86 Honyo
4.86 fish28
4.72 Dude111
4.68 DontMessWithMee
4.62 icanofer
4.62 Maser
4.58 alex_sfb
4.47 __iRambo
4.44 michl
4.43 villalobster
4.31 twiga
4.31 Who'sNutz?
4.28 Bart Lee
4.25 {A}Monkey SLayer
4.24 Tiboum
4.22 wishbone
4.13 arobi
4.11 Spudss
3.96 parsifal
3.95 asasama
3.92 captainLAGER
3.92 Gurg1
3.78 Smoke Two Joints
3.66 THRILLHO
3.66 Soromon
3.62 longpube
3.56 Gadjet
3.55 spman
3.46 franklyghost
3.42 integraI
3.33 masterDD
3.23 moneymaker$$
3.18 Plugmeon
3.09 Brighty
3.07 potato27
2.87 AIex_o
2.79 Yuck_Fou3
2.27 moulue
2.13 Loobee
2.08 apignarb
2.03 k?lllll
1.97 Ninjamonkey
1.79 vicsf
1.61 1st.skyler
1.56 chiefdrunk
1.35 Kingofskillz
1.20 Melphis
0.83 beevoh
0.50 Voo