Police guard the house of 72-year-old Rosemary Shearman, who was killed in a random attack by a stranger.
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A woman died as she crossed the road when she was struck by four separate motorists who police believe did not stop.
Patrols including local volunteers have been set up after the grisly finds in Thamesmead in the last month.
Thieves targeted a property in Richmond on Monday afternoon.