A man accused of the fatal shooting of a teenager in Adelaide's south on New Year's Eve has had new charges laid against him.

Lewis McPherson, 18, died in hospital after he was shot in Sixth Avenue at Warradale while walking to a party.

The man charged with his murder has turned 18 since the shooting occurred and today appeared in the Youth Court.

He abandoned an application for bail after new charges were brought against him, including two firearms offences, two counts of attempted murder and five of endangering life.

Prosecutors told the court he was arrested near the scene of the shooting on the roof of a house where a gun was also found.

The court heard he went to school with his alleged victim and had greeted him before the incident.

The court was told the case against the accused man was strong because there were several eye witnesses.

He will reappear in court in March.