The French striker says he is relieved his family were not at home as he played against Newcastle United.
Jane Coates wrote to Cheshire police urging them to gather evidence into Lucy Harrison's killing.
The man was recovered from the water and airlifted to hospital but was pronounced dead, police say.
Police said the recording, in which she is heard saying "no", provided key evidence.
The money paid to Michael Fogg could have been used by Cancer Research UK to pay for 48 biopsies.
A coroner says there is a risk of further deaths unless the National Lottery is included in the scheme.
