Sacramento: As the authorities are investigating the motive behind the California shooting spree that killed six people, Lt. Mark King of the Kern County Sheriff's Office said that there is strong indication that it is a case of domestic violence.

Detectives are currently questioning around 30 witnesses and are trying to piece together the episode. Among the dead were the gunman’s wife and another woman, whose relationship is not known as of yet, according to a report by USA Today.

What happened?

The man first showed up at a trucking business with his wife shortly before 5:30 pm where he confronted another man.

"The suspect, the husband, shot the person at the trucking company and then turned and shot his wife, then chased and shot another man who showed up," Youngblood said.

The gunman then went to a home where he shot two people, the sheriff said.

He then carjacked a woman who was driving her child. The woman and child escaped and the man drove to a highway where a sheriff's deputy saw him, Youngblood said.

The gunman, whose identity hasn’t been released yet, saw the deputy and pulled into a lot. When the deputy confronted him at gunpoint the man shot himself in the chest.