The former Fuengirola estate agent, whose stepdaughter Amy Fitzpatrick went missing mysteriously in 2008, has a court appeal in October.
Mahon, 46, pleaded not guilty to murder of Dean Fitzpatrick, 23, last June.
He claimed Dean’s death was an accident because he ‘walked into the knife’ while they were arguing.
The family made headlines in 2008 when his wife Audrey’s daughter, Amy, who would be 25 now, went missing near their home after a night out.
She has never been found.