A judge put off sentencing a killer to persuade him to tell the grieving family where his victim's body is located.
George Smith, 60, "disappeared without trace" after becoming involved in a love triangle with a woman half his age, the Old Bailey heard.
Dwayne Cupidon, 26, was found guilty of murdering Mr Smith, who was last seen in August last year, although traces of his body tissue were found in the bathroom of his flat in Barnet, north London.
Judge Giles Forrester told him he would not sentence him until Friday after statements were read from the family.
The judge said: "They have great concern about giving George Smith a decent Christian burial.
"His whereabouts are not known to anyone except you."
If he provided information, "it would amount to some mitigation of sentence", added Judge Forrester.
But Cupidon shouted from the dock: "I didn't kill him; how can I know where he is?"
Mr Smith's former wife Judith said in her statement: "Because his body has never been found, we have not been able to grieve in the normal way.
"I only hope that one day the truth will come out and he can be buried."