Politician Ann Widdecombe gave a pre-recorded radio interview around 20 minutes before police believe she was attacked on Wednesday 8 July.
Widdecombe, 78, was found dead at her home in Devon on Thursday, having sustained serious injuries.
The former Conservative minister turned Reform UK spokeswoman spoke to British Christian radio station TWR-UK for around nine minutes via video link, but the interview was not broadcast.
The station later shared part of the recording with Times Radio, which first aired the interview on Tuesday.
In the interview, she spoke about her support for Reform UK leader Nigel Farage.
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