Marchath Marseille, was offered partial immunity in return for information leading to the recovery of the victim's body. (CBC)

Marchath Marseille will spend at least 13 years behind bars after refusing to help investigators locate the body of David Mutunzi.

In December, Marseille was convicted of the second degree murder in connection with the 17-year old's death, despite the fact that his body was never found.

Marseille, 21, looked surprised as Superior Court Judge James Brunton read his decision, Friday at the Montreal courthouse.

Brunton said he could not believe that Marseille did not know where the victims remains could be found.

A conviction for second degree murder comes with an automatic life sentence.

The Crown had argued Marseille should spend at least 15 years behind bars before being elligible for parole.

The defence had sought 10 years.

The victim's mother, Liliane Kadimashi, said the sentence will bring her no sense of closure because she has not been able to bury her son.

Earlier this month, Marseille rejected an offer of immunity in return for information about the whereabouts of Mutunzi bodies.

The immunity would have applied only to the new facts, and only should Marseille decide to appeal his conviction.

During the trial, witnesses described seeing the Marseille old shoot Mutunzi in the head in Montreal North.

Marseille's car was found covered in the victim's blood.