There is such a conflict of interest, but he probably didn't have an active role in deliberating on this case.
Sheila's suicide was somewhat implausible if the police found her body and the rifle positioned as they described. If the photographs show their descriptions were significantly inaccurate, the true original positions of the body and gun when Sheila died are not known reliably, so that suicide remains plausible. If this matter were raised at an appeal hearing, the court could be asked to rule that the prosecution must release all the remaining photographs taken of Sheila's body before it was taken away.