Suffolk Police has confirmed that the Independents Police Complaints Commission is to investigate claims that police officers visited Fiona Anderson the day before her death.
A spokesman said the officers spoke to her via intercom after reports that a man had been stabbed near her home by an unknown offender.
Post mortem tests on Ms Anderson's three children have proved inconclusive and further tests will be conducted.
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"Our ability to pre-empt or respond to threats will be eroded if we don't keep up with our adversaries."
"You are one of the silence breakers and we all owe you a debt of gratitude."