"The suspect - the husband - shot the person at the trucking company and then turned and shot his wife" Mr Youngblood said.
A gunman killed five people in back-to-back shootings in Bakersfield on Wednesday evening before turning the gun on himself when he was confronted by a deputy, authorities said.
"We have six deceased, one is the suspect and five are victims", said Lieutenant Mark King of the Kern County sheriff's office after the shooting in the city of Bakersfield.
The suspect then left the trucking company and went to a nearby home on Breckenridge Road where he confronted a man and a women before shooting them to death.
"Obviously, these are not random shootings", the sheriff said.
"This is the new normal", said deputy Donny Youngblood.
Youngblood said he would consider it a mass shooting, saying that the string of shootings were "certainly" connected.
Sheriff's interviewed more than 30 witnesses and have served five search warrants, according to the CBS affiliate KBAK-TV.
Investigators say the gunman later drove to a home, where he killed two other people.
Bakersfield is a city of approximately 380,000 residents in southern California, about 100 miles north-northwest of Los Angeles. The suspect went with his wife together to the business to confront the man, he added.
He then carjacked a woman who was driving her child. "We believe it's possibly a domestic violence incident".
People were seen late Wednesday night crying in front of Bear Mountain Sports. A victim happened to be in the area and was chased around the building before being shot, Youngblood said.
"There was some type of situation that caused the husband to be extremely upset", he said.