Kenneth Law admitted charges relating to Canadian victims - but families say he should also be charged in the UK over 79 deaths in Britain.
A man, a woman and a child were pronounced dead at the scene in Elephant and Castle.
The former first minister says she didn't think it was fair that Murrell - who embezzled more than £400,000 from the SNP - should lose his job when she became SNP leader.
The Metropolitan Police said the allegations relate to the targeting of a UK-based journalist working for Iran International.
The Tory leader sends an open letter to former Labour PM Sir Tony Blair following his critique of the government.