When a tourist at a Tibetan hotel discovered a foul odour in his room and wanted to be moved, he had no idea he'd become embroiled in a murder case.

The tourist spent half a day in the hotel trying to figure out where the stench was coming from, initially suspecting the bakery downstairs or his own feet.

However, he was later informed that it came from a dead person under the bed.

PHOTO | COURTESY tourist finds a dead body under his bed

According to reports in China's state-owned media, the traveller, identified only as Mr Zhang, booked into the hotel in Lhasa on April 20, which is famous among online influencers.

But it wasn't until two days later, after he'd changed rooms, that he discovered what was causing the odour when he was summoned back to the original room by several police officers.

 He explained to Shangyou News that they told him that someone had died when he asked what had happened upon asking where they said that under his bed.

The police informed him that a murder inquiry had been launched into the matter, but he was not a suspect because the body had been under the bed for days before his arrival.

Many state-affiliated news sites in China have published video evidence of the following arrest of a suspect on a train going for Lanzhou, a city around 2,000 kilometres from Tibet.

Zhang told Shangyou News that he had departed Tibet as soon as he helped the authorities with their inquiry.

But he claimed he was still reeling from the shock and had been unable to sleep since.

"I stay up until 2am to 3am every morning, and the slightest movement would wake me up," he explained. "It has left me in a bad mental state."