At Oxleas NHS Foundation Trust we are very sorry and deeply saddened by Mrs Mager's death and would once again like to offer our sincere condolences to her husband and family.
We undertook an internal investigation following Mrs Mager's death, which identified some learning for us. We take the death of a patient very seriously and have since taken further expert advice.
Following this, we will now review our internal inquiry to identify further learning and ensure that this is put in place.
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Officers were given the touching letter at Brixton Station while they were on a reassurance patrol after yesterday's attack
The 52-year-old had previous convictions for violence but was not on the anti-terror watchlist.
In a statement Charlton Athletic said: Keith was a true hero who will be greatly missed by all the Charlton family and everyone at the club.