A 19-year-old man was arrested by Hong Kong police on Tuesday for allegedly murdering of his 20-year-old girlfriend during a trip to Taiwan and dumping her body near a metro station.

The suspect, an associate degree student, confessed that he killed Poon Hiu-wing and stuffed her body in a suitcase and dumped it in a park outside the Zhuwei metro station in Taipei, the Oriental Daily reported.

It was believed the pair travelled to Taiwan on February 8 and checked into the Purple Garden Hotel near the Zhongshan metro station on February 13. However, the man returned to Hong Kong alone on February 17.

When Poon’s father discovered his daughter was missing, he located her boyfriend, who claimed the two had a quarrel in Taiwan and went their separate ways, adding he did not know her whereabouts.

The father filed a report to police who sought help from their Taiwanese counterparts. He also went to Taiwan and reported his daughter missing to Taiwan police.

After checking surveillance camera footage, Taiwan police discovered the two returned to the Purple Garden Hotel in the early hours of February 17 with a pink suitcase.

The man was then seen leaving the hotel at 11am alone with the pink suitcase. He returned to the hotel at 6:28pm, then checked out and returned to Hong Kong.

At 5pm on Tuesday, police found the man in Tseung Kwan O. He was arrested for theft as he was carrying Poon’s bankcard and allegedly withdrew HK$13,000 (US$1,657), Ta Kung Pao reported.

Under police caution, he admitted he had killed Poon and stuffed her body in a suitcase, which he said he put in a park outside the Zhuwei metro station in Taipei.

Taiwan police found Poon’s body near Zhuwei metro station at 9pm.