Another man, aged 40, was rushed to hospital with minor injuries after the group allegedly bashed him with a hammer.
Police Inspector Jim Plowman confirmed this morning that a 13-year-old girl was in the Brittany Court home at the time of the incident and tragically witnessed her father being shot to death.
Police are now appealing for witnesses to come forward or anyone who might've seen the altercation early this morning.
Detectives are hunting for four men, believed to have fled from the scene after the incident.
"A black, new model, Holden Commodore utility with no registration plates was observed leaving the address and was last seen driving on the Mount Lindesay Highway," police said in a statement.
"Police are appealing to anyone who may have witnessed — or has dash camera footage or CCTV — of the vehicle, in the vicinity of Brittany Court before 6am today, to come forward."