Police in the northern province of Bac Giang said Monday that an 18-year-old youth was the only culprit in the murder of a couple and their daughter at a local gold store three months ago.
The police have finalized investigations and concluded that Le Van Luyen committed the murder alone. A trial for him may be opened in December, newswire VnExpress quoted a police official as saying.
On August 24, when it was raining, Luyen snuck into the Ngoc Bich Gold Shop. Trinh Van Ngoc and Dinh Thi Chin, the couple that owned and lived at the shop, and their 18-month-old daughter, were fatally stabbed.
Luyen also cut off the right hand of Trinh Ngoc Bich, the couple's eight-year-old daughter, and slashed her arm and head.
Bich later had her hand rejoined and has recovered.
Luyen collected all the gold in the shop, estimated at 1,875 grams, (worth US$96,000).
One week later, he was arrested at Na Hinh, a border village near China in the northern province of Lang Son.
Luyen has been charged with "murder, "robbery" and "abusing credibility to appropriate properties."
According to prosecutors, Luyen borrowed the motorbike of Truong Van Nhi, his aunt's husband, and pawned it for VND5 million (US$240).
He later bought a mobile phone and went to Hanoi to hang out with his friends.
When he got back home, he formulated the idea of staging a robbery to have get money for the bike.
Five people, including Luyen's father, aunt and cousin, are also charged with aiding and abetting Luyen.