VISTA, Calif. -  

Authorities Thursday are continuing to investigate a shooting involving a sheriff's deputy in Vista that left one man dead.

The gunfire in the 1500 block of Bonair Road near Palomar Place was reported at about 4:45 p.m., San Diego County Sheriff's Lt. Scott Amos said.

Investigators told 10News a deputy noticed the man had what looked like a knife in a parking lot on Palomar Place.

"The suspect appeared to be holding what appeared to be a knife between his arm and the side of his body," said sheriff's Lt. Glenn Giannantonio.

The deputy then got out of his marked patrol car and walked up to the suspect.

"The suspect began to fight with the deputy," said Giannantonio. "During the struggle, the suspect was able to remove the deputy's Taser from his belt holster."

The deputy then backed off and opened fire.

"Unfortunately, the suspect was pronounced dead at the scene," said Giannantonio.

Investigators will not say how many shots were fired. They will only say it was more than one.

It is unclear if the Taser was used. 

"We don't have any information whether either the suspect or the deputy deployed the Taser," said Giannantonio. "We found Taser cartridges, a Taser laying up there. There are other items of the deputy's gear that is strewn around the parking lot where we believe the struggle took place."

Investigators are now going door-to-door to interview neighbors to piece together what happened.