Sgt. Robert Goetz said many unanswered questions remain, and investigators are still working to piece together the exact circumstances surrounding the shooting spree.

"There is a lot of hard work being done by our investigators right now," he said at a news conference Thursday morning.

Officials on Thursday morning released a complete list of names of those who were killed:

- Deputy Anne Jackson, 40
- Chester Rose, 58
- David Radcliffe, 58
- Greg Gillum, 38
- Julie Binshcus, 48
- Leroy Lange, 64

Goetz said Skagit County Prosecutors expect to file murder charges by Friday afternoon against 28-year-old Issac Zamora, who was arrested for investigation of the six murders and was ordered held on $5 million bail.

Memorial plans for Sheriff Deputy Anne Jackson are still being decided, but at the news conference Thursday, Skagit County Sheriff Chief Deputy Will Reichardt read a statement from Jackson's family:

We, the family of Anne Jackson, want to acknowledge and extend our profound gratitude to all those people, relatives, friends, complete strangers, and the law enforcement community who have come forward to assist and comfort us in this tragic time.

From the depth of our grief, not only for Anne, but for all of the families affected by this horrific event, we also want to say how proud were and are of Anne. She was committed to her work in the finest sense. She saw her job as an opportunity to help the people of her community.

She was a cheerful and giving soul, loving and beloved. We know that she knew, and had offered her personal help to the family of the man who committed this terrible act, because she had experienced the pain of a similar mental affliction suffered by her own brother.

The sorrows and tragedies of mental illness affect the health of the whole community. We wish to make it clear that we hold no animosity toward Issac Zamora or his family.

Anne Jackson will be remembered with love and respect by everyone who knew her.

The mother of suspect Isaac Zamora, who was released from jail less than a month ago, said he is "desperately mentally ill" and had been living in the woods. Dennise Zamora said Deputy Jackson had tried to help their family for years.

A motorcade escorted a hearse bearing the body of Jackson on Wednesday from Alger to a funeral home in Mount Vernon. Dozens of police cars and motorcycles joined in.

Tributes to Jackson, flowers, lighted candles, a stuffed bear and a handwritten banner reading "Heroes (at) home in our hearts" were placed outside the sheriff's office. Jackson is the second Skagit County deputy to die in the line of duty.

County court records show Zamora has a history of petty violence and theft, including one case in 2003 in which he was charged with biting the hand of an employee of a drug treatment center. That case was dismissed.

Zamora remained silent during his brief court appearance on Wednesday afternoon.

The attacks began Tuesday afternoon close to the home of his mother near Alger, Wash. They continued amid a high-speed police pursuit on Interstate 5 and ended in Mount Vernon, about 20 miles south of Alger, when Zamora was arrested at a sheriff's office.

Deputy Anne Jackson and Chester M. Rose were both shot at the same location near Alger; two construction workers who were found shot nearby, David Thomas Radcliffe and Gregory Neil Gillum both of Mount Vernon. Julie A. Binschus, of Sedro-Woolley, was found a few houses away, and a motorist, Leroy Lange, of Methow, was shot and killed along the freeway.

Four other people, including a state trooper, suffered gunshot wounds or stabbings. Authorities say they have not determined a reason for the rampage.