Deakin, 20, is now facing 11 charges, including the alleged stabbing of his grandparents Gail and Thomas Winner at their Bega home, and allegedly attacking former police officer Mick Horne, 54, with a hammer during an alleged carjacking on June 1.

Ms Winner and Mr Horne died as a result of their injuries.

Deakin is also facing two charges of wounding with intent to murder, and assaulting police causing actual bodily harm.