[FourPeas]

"The cause of death is drowning. Drowning does not give rise to a homicide (designation), so obviously, there was something else."

Something other than the access panel being replaced?

[WestCoastGal]

I don't know, but I think that panel being replaced would be the biggest clue.

Odd that they have opened another case in a different type of secure plant now. See above post.