SEATTLE -- Before Susan Powell went missing in December 2009, she reportedly wrote a letter stating if she was found dead it may not be an accident.

The letter titled Last will & testament for Susan Powell was found in her safe deposit box, search warrants revealed Friday when a Pierce County judge unsealed them. The letter stated it should not be shown to her husband, JoshPowell, because she did not trust him.

Read the unsealed documents - click here

In addition, the search warrants show Susan's blood was found in the couple's suburban Salt Lake City house when police arrived to investigate the disappearance. Police noted a couch with two fans blowing air on it, near where blood was found.

Officers also found a tarp, gas can and shovel in Josh's car shortly after Susan went missing.

How much more do you need? asked Chuck Cox, Susan's father. Tonight from his Puyallup home,he said he'sdisappointed in investigators.

It's just frustrating, Cox said after reading the documents. I did everything in my power to ask them would they please arrest him if they had enough? If they think they were even close, would they do it? They assured me they were doing the best that they could at the time.

Josh Powell killed himself and his two young sons in Graham earlier this year, more than two years after Susan disappeared. The unsealed search warrants were served on the Puyallup home of Josh's father, Steven Powell, last fall.

Josh Powell always maintained his innocence and said he had taken their boys, then 2 and 4, on a midnight camping trip in freezing temperatures the night she disappeared.

One of the children, Charlie, told investigators in an interview shortly after Susan Powell disappeared that she had gone on the camping trip with them but did not come back home and did not know why, according to the files. A few weeks later, he told a church teacher with no emotion: My mom is dead.

During their investigation, police learned Susan had a $1.5 million life insurance policy and Josh was the beneficiary. Josh once talked about his love of camping in West Utah, where there were mine shafts that, according to the search warrants, you could dispose of someone.

There is direct evidence. There is circumstantial evidence. There is motive, said Pierce County prosecutor Mark Lindquist. There is everything but the body.

Lindquist said he would have charged Josh Powell with murder if it was his case. However, Lindquist said Utah law may have prevented police there from doing the same thing.

When the search warrants were served in August 2011, investigators were looking for Susan's journals, on the theory that her personal writings might shed light on her disappearance.

In conducting that search, police found child pornography in Steven's possession, leading to his arrest. He is currently awaiting trial but attended Friday's hearing in handcuffs. He had no remarks when asked about his son's death.

West Valley City police on Friday refused to expand on any details revealed in the search warrant because the investigation is still ongoing, said Sgt. Mike Powell, who is not related to the Powell family.

This case began as a missing person case and remains as such, he said. But due to the suspicious nature ... murder and kidnapping have not been excluded.

Although police have only identified Josh Powell as a person of interest, Sgt. Powell didn't rule out eventual charges against his father, Steven Powell.

History of Susan Powell case

TIMELINE: Major developments in the Susan and Josh Powell case

The case has traveled along a twisted path since December 2009 when Susan, formerly from Puyallup, mysteriously went missing from her home in Utah. Josh told police she ran off and that went on a late-night camping trip in the Utah desert with his two young sons, Charlie and Braden.

Detectives spent months looking for Susan, scouring the desert for her remains, which were never found. Josh was named a person of interest in the disappearance.

It was only recently revealed that around the same time, West Valley Police uncovered hundreds of pornographic images from Josh's computer, many showing cartoon figures and sex between parents and children.

Josh later moved his sons back to Puyallup to live with his father, Steven. In the autumn of 2011, police determined that Josh's living situation was not suitable for the two children after investigators said they found child pornography at the home. Charlie and Braden were put in the custody of Susan's parents, Chuck and Judy Cox.

Still, Utah Police could not tell Washington authorities about the incestuous images on Josh's computer because of a court order. Those records were unsealed only after Josh attempted to get custody of his children last year.

A Washington state psychologist reviewed the images and ordered Powell to undergo a psycho-sexual evaluation.

Six days later, onFebruary 5, Josh Powell killed himself and his two sons when they arrived for a court-ordered supervised visit. Investigators determined he attacked the boys with an axe, spread gasoline all over his house in Graham and lit a match, causing a huge inferno.

The DSHScase worker frantically called 911 after she said Powell took the boys and slammed the door in her face. Minutes later, she witnessed the home explode into flames.

Steven has pleaded not guilty to 14 counts of voyeurism and one count of possession of depictions of minors engaged in sexually explicit conduct in the second degree. Last fall, Steven declared he and Susan had been in love. After Josh's murder-suicide, investigators said images seized last fall from the elder Powell's home were of Susan and clearly taken without her knowledge. Photos of young girls who lived in Powell's neighborhood were also found, investigators said.

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