Mouner Kasem hit out at Jean Kasem – Casey's wife of 34 years – after it emerged the family has not been told where the TV personality will be buried and amid reports his remains have been shipped to Canada.
In his first interview on the death of his brother the 78-year-old told MailOnline: 'It's a sick joke from a sick woman. It's a sick joke that Jean would say she lived in Jerusalem, Israel on the death certificate and it's a sick joke that she said his body is to be shipped to Montreal in Canada, a place Casey has never even been to.'
This comes as Casey's daughter Kerri says she suspects that her father may have already been buried in Los Angeles in a secret funeral service.
Kerri revealed that her 'sources' told her that Jean Kasem and daughter Liberty were seen attending a funeral over the weekend.
'We would like to know where Casey is buried,' he said. 'We want to be able to visit his grave and put flowers on the gravestone, you know on his birthday or on the day he died.
'But our fear is that that may never come. I truly believe that Jean will not tell us.
'Taking into account her behavior during this last year it is really not surprising that she won't tell us where the body is buried and I don't know if she ever will.
The Santa Monica police department is currently investigating claims of elder abuse against Casey in his final months.
'The Santa Monica PD wants the body for autopsy, not the Kasem family. We know what went on, we know of the medical records, we know what happened.'
Kerri added that there's 'overwhelming evidence' of how her father died but it's up to the District Attorney's office whether to bring any kind of prosecution.