When a player was killed by a zombie there may be a wrong ADM log record indicating that player was killed by another player. Please take a look at the logs below:
18:51:41 | Player "xLORD GHOSTx188" (id=9A4EA3B93A6125D3A8F032DD3F9700EC94EAEAD3 pos=<11944.3, 12043.1, 128.1>)[HP: 15.1298] hit by ZmbF_VillagerOld_Blue into LeftArm(18) for 5 damage (MeleeZombie) 18:51:41 | Player "xLORD GHOSTx188" (id=9A4EA3B93A6125D3A8F032DD3F9700EC94EAEAD3 pos=<11944.3, 12043.1, 128.1>)[HP: 10.8798] hit by ZmbM_Jacket_bluechecks into Torso(1) for 4.25 damage (MeleeZombie) 18:51:42 | Player "xLORD GHOSTx188" (id=9A4EA3B93A6125D3A8F032DD3F9700EC94EAEAD3 pos=<11944.3, 12043.1, 128.1>)[HP: 10.3798] hit by ZmbF_JoggerSkinny_Red into RightArm(17) for 5 damage (MeleeZombie) 18:51:42 | Player "xLORD GHOSTx188" (id=9A4EA3B93A6125D3A8F032DD3F9700EC94EAEAD3 pos=<11944.3, 12043.1, 128.1>)[HP: 9.87976] hit by ZmbM_VillagerOld_Green into RightArm(17) for 5 damage (MeleeZombie) 18:51:42 | Player "xLORD GHOSTx188" (id=9A4EA3B93A6125D3A8F032DD3F9700EC94EAEAD3 pos=<11944.3, 12043.1, 128.1>)[HP: 9.32921] hit by ZmbF_VillagerOld_Blue into LeftArm(18) for 5 damage (MeleeZombie) 18:51:43 | Player "xLORD GHOSTx188" (id=9A4EA3B93A6125D3A8F032DD3F9700EC94EAEAD3 pos=<11944.3, 12043.1, 128.1>)[HP: 5.07921] hit by ZmbM_Jacket_bluechecks into Torso(1) for 4.25 damage (MeleeZombie) 18:51:43 | Player "xLORD GHOSTx188" (id=9A4EA3B93A6125D3A8F032DD3F9700EC94EAEAD3 pos=<11944.3, 12043.1, 128.1>)[HP: 0.829208] hit by ZmbF_JoggerSkinny_Red into Torso(1) for 4.25 damage (MeleeZombie) 18:51:43 | Player "xLORD GHOSTx188" (DEAD) (id=9A4EA3B93A6125D3A8F032DD3F9700EC94EAEAD3 pos=<11944.3, 12043.1, 128.1>) killed by Player "Your Death9546" (id=BAEBEA1ED197A20BDA51805B816B767F0D33F8DF pos=<3100.7, 5985.0, 289.4>) 18:51:57 | Player "xLORD GHOSTx188"(id=9A4EA3B93A6125D3A8F032DD3F9700EC94EAEAD3) has been disconnected
As you can see, Player "Your Death9546" was miles away from Player "xLORD GHOSTx188" when that kill appeared in the log file.