A British medical student killed in Borneo has been described as a "totally nice guy".
Neil Dalton and Aidan Brunger, who were in their fourth year studying medicine at Newcastle University, were stabbed to death on the island following a row in a bar.
Mr Dalton's neighbour - who nicknamed the 22-year-old "Dr Biscuit because of his ginger hair and medical studies - said he was a "bright, self-motivated man".
"I'm totally shocked at the news. He was just a lovely boy. Totally self-motivated. Always jogging and studying," the 50-year-old, whose daughter went to school with the victim, said.
"I think he'd always wanted to do medicine. He was always studying.
"It's just such a shock. He was just a totally nice guy. He wasn't gregarious, just a fun, genuine guy," she added.
The family of Aidan Brunger, one of two British students stabbed to death in Borneo, have released a photograph of the 22-year-old outside the hospital where he had been training.
Images removed for rights reasons
Images have emerged of the arrests of the men suspected of involvement in the fatal stabbings of British medical students Neil Dalton and Aidan Brunger in Borneo.
Four local men have been remanded in custody following the early morning deaths in the city of Kuching in the Malaysian part of the island.
Prostate Cancer UK has paid tribute to one of the two Newcastle University medical students stabbed to death in Borneo, who had raised £400 for the charity last September.
Aidan ran the Great North Run for Prostate Cancer UK last year and he raised several hundred pounds for our work to beat prostate cancer. We are very saddened to hear news of his death in such devastating circumstances. Our sympathy goes out to all his family and friends.
The two Newcastle University students stabbed to death in Borneo were set to embark on hugely promising medical careers, the university has said.
Professor Jane Calvert, the university medical school's dean of undergraduate studies, said Aidan Brunger had aspirations to be an academic medic while Neil Dalton wanted to head into clinic practice.
Prof Calvert said the 22-year-olds' study abroad was a standard practice in their development after their fourth years and said the university would never send its students to high-risk areas.
A local fishmonger is considered the main suspect by police after the fatal stabbing of two British students in a reported bar row in Borneo, a local reporter has told ITV News.
Sharon Ling from Malaysian newspaper The Star said the 23-year-old man was arrested along with a 29-year-old mechanic and two other unemployed men.
She said all four would be remanded for seven days following the early morning killing of Neil Dalton and Aidan Brunger from Newcastle University.
Ms Ling said the island was in shock at the deaths, which she said occurred in an area generally considered to be safe.
Images have emerged of the two Newcastle University medical students stabbed to death in Malaysia.
The two Newcastle University medical students stabbed to death on Borneo had been due to finish their training at the local hospital on Friday, according to local police.
Fourth-year students Neil Dalton and Aidan Brunger, both 22, were on the Malaysian part of the island on attachment to a hospital in Kuching.
Deputy police commissioner Datuk Dr Chai Khin Chung told the Malaysian State News Agency Bernama that the fight in which they were killed broke out after an argument in a bar over the students being too noisy.
He reportedly confirmed four men remain in custody after the 4.15am attack in the Jalan Padungan area of Kuching in the western province of Sarawak.
Newcastle University has released a statement on the "tragic" deaths of two medical students killed in the Malaysian city of Kuching.
Acting vice-chancellor Professor Tony Stevenson said: "We were informed this morning of the very sad news that two of our fourth-year medical students working at a hospital in Kuching, Borneo, have been tragically killed."
"Neil Dalton and Aidan Brunger, both 22, were on a six-week work placement, along with five other medical students, to put the skills they had learnt during their time here at the university into practice," he added.
Professor Stevenson said the news was a "huge shock" and added that two members of university staff were flying to Kuching "as soon as possible" to co-ordinate the return of the other students.
The two British students stabbed to death in Malaysia have been named as Neil Dalton and Aidan Brunger, Newcastle University has confirmed.
The pair were reportedly on a six-week placement at a local hospital and were due to return to Britain later this month.