A witness in a Crime and Corruption Commission investigation has been jailed for 2½ years for refusing to reveal the whereabouts of $1.8 million in alleged drug money.

The witness, known only as "Witness JA" in court documents, was summonsed to a then-Crime and Misconduct Commission investigation into the murder of "an identified person".

A witness in a murder investigation has been jailed after hiding $1.8 million in alleged drug money and refusing to reveal where it is.

Witness JA, who was related to the murder victim through marriage, was called as a witness to the CMC hearing.

Once sworn in, Witness JA testified he had taken about $1.8 million from his safe deposit box so the police could not seize the money.