a would-be cage fighter accused of beheading a great-grandmother in her garden in september last year .
the widow ran a successful cafe , silva 's cafe , in church , edmonton - where members of the public laid floral tributes after her murder on september 4 last year .
mrs silva moved to london from her native southern italy with her husband domenico six decades ago .
several of the victim 's relatives , including her daughter celestina , were in the courtroom to witness the plea .