The special TADA court yesterday convicted Salem, his driver Mehendi Hassan and builder Virendra Jhamb for the 1995 murder.
"The accused (Salem) not only killed Jain but also enjoyed the act of killing him and this amounts to cruelty. He had total disregard for human life and to curb this, a deterrent sentence needs to be awarded," Special Public Prosecutor Ujjwal Nikam told the court.
Saying that the case fell in the rarest of rare category, Nikam termed Salem "a contract killer, merchant of death and captain of the ship of underworld".
"Salem exhibited his cruel nature by calling Jain's wife 13 days after the killing and asked her if she was mourning her husband's death and laughed," Nikam said, further submitting that even on that day he asked the family members to pay up and threatened to eliminate them if they failed.
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The prosecutor argued that there were many aggravating circumstances and no mitigating ones.
Nikam sought death penalty for Salem and Hassan but sought seven years' imprisonment for 86-year-old Jamb.
"The prosecution ought not to have demanded the capital punishment as it is violation of the treaty with Portugal government under which Salem was extradited," he said.