He died when it melted. So what happened?
The culprit wished to kill the victim without leaving a trace. So they gave the victim a necklace with a pendant of some kind. The pendant was made of Substance Y - which either reacts violently with steam or reacts violently when jostled - encased in Substance X - which melts when heated and moistened. The victim entered the shower, and the trap was activated; X melted, releasing Y, which exploded, which killed him.
Audra's theory is pretty much how the original scenario played out. Here's how it happened.
The victim was an athlete and ace striker on his team. At a children's charity game three weeks before an important title match, he is presented with a commemorative gold medal on a chain, an appropriate present considering the occasion. An image of the victim heading a ball into a net was carved into the surface. The victim was accustomed to wearing jewelry and the award was presented by the very children who would benefit from the game's revenue so there was little suspicion. He puts it on immediately, looking forward to showing it to his daughter.
Following the end of the game, the victim enters the locker room to shower. He turns the shower on full and steps into the stream of water. The victim knew there was something wrong when he felt an intense burning. For a moment, he thought the water might have been too hot. Then he looked down and saw a brilliant light emanating from his chest. He opened his mouth to scream, and at that moment something exploded. The scream died in his throat.
Here's the science behind it.
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