Cathy Dixon - Whodunit?

Solve the whodunit below and stand a chance to win a $50 Amazon.com gift card.

Updated 23rd June 2013

It's 9.00am on a Sunday morning. Adam, the pool attendant at MoonStar Rio De Janeiro, Brazil has just started work.

He is hung over and not at all looking forward to another day of handing out towels and serving cocktails.
As he opens the glass doors, a strange smell hits him in the face and he almost throws up. A bloated male figure dressed in a grey suit is floating face down in the pool.

Talk about a wake-up call. The Front Office Manager is called, security is informed and the pool is closed.
When the police arrive they find nothing but his room key card and a faded picture of a young woman in his pockets.
Inside his guest room, his one travel bag remains unpacked. He had paid cash for his room and given his identity as Mark Walker.
The Housekeeping Manager, Julia comes forward to say that she saw him arguing with a woman by the pool side and he appeared to be drunk.

Walker's old friend approaches MoonStar and says he had been looking for his first wife. They had married young, he had lost his job and started drinking. Things got worse and one night had almost pushed his pregnant wife out the window.

She had taken their two kids and never looked back. Walker wanted nothing more than to see his kids one more time. He had sobered up and started looking for them. He knew she had family in Brazil and the last clue he received led him to MoonStar Rio De Janeiro.

Who killed Mark Walker?

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