The political pull-back is in stark contrast to a debate that was otherwise reaching fever pitch less than a week before Brits headed to the polls.
Just on Wednesday, Cox's husband and children were on a boat on the River Thames in support of the 'Remain' camp, as Brexit supporters took to their own flotilla. Both sides trading insults over loud speakers and in one of the stranger moments, protesting fishermen deployed water hoses.
Since news of the attack, the tone has darkened.
On Thursday night, Bank of England Governor Mark Carney, who has been criticized for making comments on the economic risks of the upcoming referendum, changed direction in a speech to London City bankers, taking the opportunity to pay tribute to the slain politician.
Meanwhile, the International Monetary Fund, which has warned about the consequences of leaving the EU, delayed the release of a report on the impacts of a Brexit.