His widow has reportedly flown to the United Kingdom to organize his affairs.
McKenna was originally from Harrogate, North Yorkshire, but studied in Australia.
His father told Australia 9 News, Its soul-destroying.
I dont know where to move, I dont know what to do.
Moorhead said, [Allen] deserves better.
He deserves to come back here to South Australia and then all the family can have closure.
Saying that Mjaoual isnt responding to his calls, Moorhead continued, Its just unbelievable.
[Ms. Mjaouals] not answering any messages, phone calls, texts…nothing.
I just want my lad back.
Moorhead is also quite vocal on Facebook, referring to himself as a grieving father.
Mjaoual said, His father is harassing me, and you dont know whats going on.
If his father wants to know anything, he can use lawyers.
It is signed by Dr. Abdelilah Lekbiri, a forensic medicine specialist.
Allen passed away at my home in Casablanca in his sleep, and he was buried after an autopsy.
He was an amazing guy, the best person I have ever met.
The couple allegedly had a big falling out with Moorhead, as he wasnt happy with the relationship.
They often had arguments, the insider continued.
McKenna had also listed Mjaoual in his will so that she would inherit his fortune.
He was warned he wasnt in good health and was treated at Lewisham hospital for five days.
Companies House records show that McKenna had a current balance of 87,323 and was owed 1.178 million.
Mjaoual was also seen in the couples home in Harrogate with five others believed to be her relatives.
A neighbor said, I presumed she was moving out of the UK.