Code:
local function BlockSuicide(ply)
ply:ChatPrint("SUICIDING BREAKS FAILRP")
return false
end
hook.Add( "CanPlayerSuicide", "BlockSuicide", BlockSuicide )
That would do the work. Change "SUICIDING BREAKS FAILRP" to whatever you wants.
Oh. You guys gotta place it on /lua/autorun/
Create a file called antikill.lua and paste the code there.