Bangkok police arrested Kittikorn Vipaha, one of the two assailants who killed a 26-year-old man in an iPhone robbery in Lat Phrao district.
Wasin Leuangjaem, 26, was stabbed in the throat by one of the attackers who escaped as his accomplice waited on a motorcycle.
The incident took place at about 10.00 pm in Soi Sukhonthasawat 27, Lat Phrao, where police found the victim in a pool of blood.
The main suspect in connection with the deadly attack was detained in Nonthaburi, shortly after police were called to the scene.
A CCTV footage of the brutal attack has gone viral on social media.
Update: On Friday police captured the second suspect, Supatchai Chansri, who drove the motorcycle during the attack.