On Wednesday, the authorities released security camera footage which appeared to show the suspect fleeing the scene of the crime.
Union leaders say the fall is due to legal roadblocks to workers registering complaints with the country’s arbitration body.
Last year, the government rescued 85 girls from many countries, including China, according to Mu Sochua.
During Thursday’s hearing, protests took place outside the court, leading four protesters to be badly beaten by district security forces.
Annual report says civic groups in region “relentlessly threatened” amid rights set-backs over past year.
Russian lawmakers recently voted to decriminalize domestic violence in cases when there is no bodily harm. VOA Khmer's Seourn Vathana narrates.
Freedom Park had been closed since January 4, 2014, after the authorities destroyed the opposition’s protest camp.
The killing took place at a gas station owned by Caltex, a subsidiary of the California-based oil giant Chevron.
An outspoken government critic and popular grassroots activist, Kem Ley was gunned down last year on the morning of July 10 at a Caltex gas station in central Phnom Penh.
Cambodia saw nearly 1,400 strikes and demonstrations in 2016, more than three times as many as the previous year, according to a recent police report.
The original Freedom Park, near Wat Phnom in the capital’s Daun Penh district, became the focus of opposition protests in the aftermath of the disputed 2013 election.
The letter to Hun Sen expressed concerns about land grabbing, democratic governance and harassment and intimidation of the country’s rights activists and opposition party members.