A couple went on trekking trip.

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During the trip, the wife died and husband returned home.

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When police questioned him, he said, “My wife’s slipped off the mountain cliff we were climbing,

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I rushed to hold her but and I couldn’t save her in time

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The local sheriff then questioned the couple’s travel agent and upon questioning him,

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He arrested the husband saying your Travel Agent has confirmed you’re the killer.

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How did the Travel agent know the husband killed the wife ?

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   ANSWER The man bought one-way ticket for his wife but a two-way ticket for himself.  This is why the travel agent was suspicious.