Some unanswered questions.
The hotel employee allegedly came to the room to fix a sink. Does the hotel have a work order ? Did some one call in a problem with the sink.
The hotel employee had $600 in various currencies on him. The decedent's father later stated that he had given the money to his son. Did he give his son $600 in "various currencies" ?
Sound like the guy was using his hotel uniform to get into the rooms, and then rob them.