A man is found dead in a suitcase in a bathtub that was padlocked from the outside with no finger prints on the padlock. Police assume he did it himself? The keys were in the bag with him, right? And he was naked? This all happened in a bathtub? He was a spy?
Either 1) He was into weird fetishes and something went wrong or 2) He was murdered by pros that came up with a clever way to stifle investigators.
I guess motive would answer some of these questions. But it certainly appears someone else was involved.
“Don’t ask, don’t tell” has consequences.