Actually, there is no need to keep them secret.
Bingo.
When you consider the implications if he did not commit suicide, and the mass of evidence that mitigates against suicide -- and then scratch your head in amazement at how anyone could conclude that it was suicide (let alone that it become the official conclusion), there is a compelling reason for not keeping these photographs secret.
I do worry, however, that either some would be quietly withheld, or, released after being touched up. The stakes are suffiently high to make these possibilities valid concerns.