A MUM who drove her son and two teens to kill a disabled boy in a horror machete attack has been jailed. Levi Ernest-Morrison, 17, was hacked to death with knives in the street in Sydenham, South East London over a" petty rivalry between teenagers".... 2 Nicola Leighton, 37, has been jailed for at least 23 years 2 Levi Earnest-Morrison, 17, was stabbed to death in Sydenham, south east London Nicola Leighton, 37, wanted revenge when a group of teenagers including victim Levi turned up at her hom