The question would be: did Matthew actually attend the secret ceremony in person?
I assume the “secret ceremony” you refer to is the baptism. If this is the case be advised that LDS baptisms outside the temple are open to both members and non-members. The only criterion I know of is that normally one is invited to attend by the person receiving the ordinance.
It really doesn't matter, as he is DEAD now and no doubt some LDS faithful WILL be baptised FOR him in one of their Temple Rites® - 'Baptism for the Dead'.
The Church of Jesus Christ of Latter-day Saints released a statement saying, “We checked our records, and they confirm that Matthew Murray of Englewood, Colorado, was baptized about a year ago.”
The question would be: did Matthew actually attend the secret ceremony in person?
Let the bashing begin. What secret ceremony are you talking about ?