A third person is in custody after being charged with robbery offences in connection to a crash that killed a Queensland grandmother.
Rosemary Franzidis, 69, died in a high-impact collision north of Brisbane on Thursday after an Audi was allegedly stolen by a 16-year-old boy at gunpoint.
The boy is in custody on a string of charges including manslaughter, and a 35-year-old woman has also been arrested as part of the investigation into the fatal Murrumba Downs crash.
Dylan Lawrance Anderson, 21, is the third person charged over his alleged links to a stolen orange Holden Barina hatchback seen before the fatal crash.
It is believed the car was stolen from a property in Northgate between November 6 and 7.
Police allege the occupants of the Barina - including the boy, 35-year-old woman and 21-year-old man - arrived at Griffin about 9.30am on Thursday and the teen got out, threatening a woman with a firearm.
He allegedly stole the Audi that was later involved in the crash that killed Ms Franzidis.
Anderson has been charged with two counts of attempted robbery while in company and armed, and one count of robbery in company while armed and unlawful use of a motor vehicle.
He appeared in Brisbane Magistrates Court on Tuesday and was remanded in custody.
Anderson's matter will next appear in court on November 25.
