Ferdy Sambo, an ex-inspector general and head of internal affairs with the national police whose trial began in October, appeared before a panel of three judges at a court in Jakarta.
Sambo has been "proven legally and convincingly guilty of committing the crime of participating in premeditated murder," Judge Wahyu Iman Santoso said while reading out the ruling.
Prosecutors had called for a life sentence.
Sambo's lawyer Arman Hanis told reporters his legal team will study the ruling but declined to say whether it would appeal.
Sambo has been "proven legally and convincingly guilty of committing the crime of participating in premeditated murder," Judge Wahyu Iman Santoso said while reading out the ruling.
Prosecutors had called for a life sentence.
Sambo's lawyer Arman Hanis told reporters his legal team will study the ruling but declined to say whether it would appeal.