The family of coward punch victim Thomas Kelly hope a new CCTV camera in Kings Cross will make people think twice before orchestrating a violent attack.
The Thomas Kelly Foundation was established following the 18-year-old's death in 2012.
Thomas was fatally punched while walking through Kings Cross with friends.
Last year Daniel Christie was punched on the same stretch of road.
He died in hospital from critical head injuries.
The foundation, established by Thomas' parents Ralph and Kathy Kelly, and the City of Sydney have funded a CCTV camera in Victoria Street to cover the spot where Thomas and Daniel lost their lives.
The Kelly family handed over the new camera on Friday.
Mr Kelly said he saw CCTV cameras as a preventative measure.
"Whilst they won't stop the assaults occurring by themselves, if it makes some people think twice before committing a violent attack, then they have an important role to play," he said in a statement.
Mr Kelly said the arrest of Thomas' attacker was supplemented by hours of vision from CCTV cameras.
The City of Sydney has a plan to install 10 extra CCTV cameras at night spots around Surry Hills, Kings Cross and the CBD.
The new cameras will be monitored 24 hours a day at the city's Security and Emergency Operations Centre at Town Hall.
