A 21-year-old woman was killed when a robber jumped in a car, demanded to be driven and then - in front of two children - shot her twice in the head before fleeing with cash, according to Chicago police.

A 21-year-old woman was killed when a robber jumped in a car, demanded to be driven and then - in front of two children - shot her twice in the head before fleeing with cash, according to Chicago police.