TUSTIN, Calif. -- Four people are dead and two others wounded in a shooting rampage in Southern California, authorities said.

One man is believed to be behind all of the shootings.

In Ladera Ranch, a woman was shot several times and killed before 4:45 a.m., said Jim Amormino, spokesman for the Orange County Sheriff's Department.

The gunman is believed to have then headed north in an SUV, where three carjackings were reported in Santa Ana and Tustin. The gunman was reported to have fired several times, killing two people.

Officers caught up with the man believed to be the gunman and stopped his vehicle near Wanda Road and Katella Avenue. The man, described only as in his 20s, apparently killed himself after officers stopped his vehicle, said Lt. Paul Garaven of the Tustin Police Department.

The relationship between the woman shot in Ladera Ranch and gunman was not clear, Amormino said. At least one other person was inside the home.

Deputies were called to the home, but the man suspected of being the gunman fled in an SUV, Amormino said.

A neighbor said he heard what sounded like gunshots before 3 a.m. Tuesday morning, followed by a lot of noise at about 4 a.m.

"I was in the garage and the door was cracked," said Jason Glass. "When I opened my garage door this morning, my whole house was covered in tape. What a way to wake up."

Tustin police then received reports of a carjacking at Red Hill Avenue and Nisson Road, where a bystander was shot, Garaven said. That person was wounded.

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