NEW FAIRFIELD, Conn. -- State police in Connecticut say it will likely be a week before they're done with an investigation into the fatal shooting of a masked teenager by his father.
The teen was shot outside a neighbor's house during what appeared to be an attempted burglary.
Spokesman Lt. J. Paul Vance said Friday that police are trying to determine if the gun used by Jeffrey Giuliano, the father, was registered.
Police say 15-year-old Tyler Giuliano died of multiple gunshot wounds early Thursday in New Fairfield.
It's reported that Tyler's father had gone outside with a gun when his sister called from next door to say someone was trying to break into her house.
Giuliano saw a masked person dressed all in black and holding a knife. Police say the person came toward Giuliano, and Giuliano shot him, only to realize that he had killed his own son.
Vance says investigators don't yet know if the neighbor called Giuliano or police first.
No charges have been filed.