WI future William the Conqueror was murdered at young age?

As a child the future William the Conqueror was in constant danger of his life by his kinsmen who believed they had a higher claim to the Duchy of Normandy...
In one case he was saved by mere chance since the assassin was mistaken and stabbed the child sleeping next to William...
WI the assassin was not mistaken and killed William? What happens next? No Norman invasion to England? How is history altered if William the Conqueror is eliminated at a young age?
 
The gradual consolidation of Anglo-Saxon England continues under Harold Godwineson's descendants, and France is far more stable rather earlier in history.
 
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