The second suspect arrested in connection with the murder of a young teenage boy in Mississauga appeared in a Brampton court Sunday morning.

20-year-old Mark Mahabir was charged with second-degree murder after he turned himself in to police on Saturday, following the issuance of a warrant for his arrest.

“A vigorous defense will be mounted,” said Mahabir’s lawyer. “He’s not guilty of this charge.”

The lawyer added that “almost no information” was presented during Sunday’s court appearance and the case has been put over till Dec. 24.

“(Thereafter the crown) is going to give a summary of their evidence, enough so we can bring an application for bail in the superior court,” he said.

BREAKING: Update from lawyer after first court appearance for Mark Mahabir, arrested last night and co-accused in Friday’s murder of 14 year old Riley Driver-Martin of Mississauga. #Video @680NEWS @CityNews pic.twitter.com/JPHKMjv0aD — Ken Townsend (@KenTownsend) December 9, 2018

Mahabir’s brother and co-accused Nicholas Mahabir, 20, was arrested on Friday after a passerby found the body of the 14-year-old boy in Meadow Park around 8 a.m.

He appeared briefly in court Saturday and the case was adjourned until next Wednesday.

Police have identified the boy as Riley Driver-Martin. Friends have confirmed to CityNews he was a student at Clarkson Secondary School.

Police have yet to reveal a possible motive for the killing, but they believe this to be an isolated incident. They would not comment on whether this was a random or targeted attack. A source told CityNews Riley-Driver and one of the Mahabir brothers knew each other.

Police are asking any witnesses or anyone with surveillance video to call them.

The Peel District School Board said Clarkson Secondary School will hold regular classes Monday and grief counsellors will be available.