Confirmed - husband or wife have their own state pension based on their own NI contributions.
If she was resident in the UK at the time of her husband's death she could claim a Bereavement Support Payment.
Occupational pensions are a different matter and she could be entitled to up to 50%.
You made your usual classic mistake of jumping in with two feet to defend Muslims - vigorously - because the link you found said he opposed Islam. You were far too quick and finish up with egg on your face when posters like @Scouse123 come with links like this:-
https://www.msn.com/en-gb/news/world/saudi-arabia-warned-germany-about-suspect-of-magdeburg-incident/ar-AA1whgpl?rc=1&ocid=winp1taskbar&cvid=fef1ae94e4674ecc9c23385c64dd1696&ei=6
It seems like @stevenl is not interested in that, being more concerned with defending the religion of peace.
Whatever religion/motive the perpetrator had is irrelevant; this was a heinous crime worthly of a death penalty.