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Shahzad's lawyers argued that he only acted to defend Fitzsimmons, who at the time was heavily pregnant with their child.
The court heard how Mr Butt and his wife lived in the flat above the family business Mazammal Halal Meats, run by Shahzad, with their rent and bills covered by income from the butchers.
While in July 2019 police were called to a family fight in the premises, supposedly born out of a row over Mr Butt's standards of work. But in the November that year matters escalated to new levels.
Fitzsimmons made an allegation about Mr Butt which sparked a showdown confrontation between the couples in the shop on November 16 - one day before the stabbing took place.