The prosecution has wrapped up its case against a man accused of murdering a Dawson student in Cote des Neiges in March 2011 during a fight over a stolen ring

Abiram Subramaniam is charged with the second degree murder of 18-year-old Joshua Williams.

As one of the final pieces of criminal evidence, the Crown played a recording made in Subramaniam's car.

In the recording, which was captured by a bug planted by police, Subramaniam can be heard telling someone that he had to be careful regarding some other illicit activity because he was already facing 25 to life for committing murder.

Defence lawyers are expected to begin presenting their case that Subramaniam did not commit the crime on Tuesday. The defence is contesting the validity of the police methods. It is not yet known if Subramaniam will testify in his own defence.

According to police, Subramaniam, then 18-years-old, stole a ring and began fighting with a friend while outside a mall on Cote des Neiges Rd.

Williams stepped in to stop the brawl and Subramaniam allegedly stabbed him six times.

Police managed to get a confession out of Subramaniam by using the 'Mister Big' tactic, where people are lured into confessing to a crime in order to convince an apparent criminal mastermind that they are worthy of joining his group.

On the recording, Subramaniam says money problems led to him wanting to take the ring.

"How many times you think you whacked him? " the undercover officer asks.

"Four, five maybe, six times maybe," Subramaniam replies. The police officer then asks how quickly it all happened.

"I think I took my time a little bit. Not too fast," Subramaniam said.

Jeannine James, Joshua's mother, says the testimony is hard to hear but she's determined to find out why her son died.

"When you come from a position of knowing aboslutely nothing except that you have a body to bury, the body of your only child to bury, and you come to a point where you have information, [that] is something to be grateful for," she said.