A simple spelling mistake on a computer database meant police missed crucial details about a man's violent past, just hours before he killed his partner.
Sarah Gosling was stabbed to death in Newcastle earlier this year. Now, the police watchdog has criticised mistakes by Northumbria police, which it says had "profound consequences."
You can see the full report from Ben Chapman below.
More top news
Veterans, cadets, dignitaries and serving Northumberland Fusiliers have paid tribute to those killed at the Battle of the Somme
Clear spells. Showers. Brisk winds. Sunday looks like the better day
Two men whose grandfathers fought in the Tyneside Irish battalion and died together on the Somme have returned to visit their graves.