Police hunting for the main suspect following the murder of a Northampton family have increased the reward for information which could lead to his arrest to £25,000.
Jifeng Ding, his wife Helen Chui and their two daughters were killed in Wootton on the 29th April 2011.
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Police investigating the murder of a family of four killed in their home in Northamptonshire are renewing their appeal to find the killer.
A close friend of a family stabbed to death in their home has criticised detectives saying more should have been done to catch their killer.