Not sure about the setElementData, But try :
brped = createPed ( 150,359.7, 173.85, 1008.39 )
setElementInterior ( brped, 3 )
setElementRotation ( brped, 0, 0, 270 )
function startbr ( killer )
local team = getPlayerTeam( killer )
if team and team == getTeamFromName( "Criminal" ) then
setPlayerWantedLevel ( killer, 6 )
setElementData ( killer, "brstart", "true" )
end
end
addEventHandler ( "onPedWasted", brped, startbr )