Emily (C), a sex worker, sits with colleagues as they wait for clients in the back of a bar in Pattaya.

Sitting on a stool under purple neon lights, Emily waited for clients in the back of a bar in Pattaya, a notorious Thai seaside resort back in the spotlight over a sordid murder.

The sex worker the other so-called bar girls call "Mum" arrived in Pattaya more than 20 years ago, but remains on her guard with every encounter.

"I'm worried and that's why I'm still alive," she said.

The naked, battered body of a 17-year-old Thai girl was found in a suitcase near a railway track last weekend, just days after she arrived in Pattaya.