Those arrested are being investigated for various offences, including cheating, abetting unauthorized access to computer systems, and money laundering.
Louis Artal, 19, is accused of killing Santos, Santos' girlfriend Sophia Troetel, 21, and Katya Rosaura Castillo Mendoza, 21, with his 2019 Porsche Boxster while he was under the influence of drugs and alcohol
The 23-year-old man, surnamed Lu, and his friend, identified as Yang, were both handed the death penalty while the third friend, identified as Cheng, was sentenced to 7 years in prison for his involvement in the crime.