He was sentenced as early as a year ago.

Sentencing method for murder:

1, intentional injury (death), sentenced to at least 10 years in prison;

2, intentional homicide, at least life imprisonment.

Your friend is underage, you can consider appropriately mitigating the punishment. He is not the principal offender and can be sentenced to fixed-term imprisonment of 10 years or less. If he has rendered meritorious service, he can consider sentencing for 3-5 years.