The 40-hour manhunt for the suspect in the quadruple killing of four police officers ended with the fatal shooting of 37-year-old Maurice Clemmons, Pierce County Sheriff's Department spokesman Ed Troyer said.

Clemmons was shot at 2:45 a.m. by a lone Seattle police officer on South Kenyon Street in the Rainier Valley. See video

SLIDESHOW: Rainier Valley Shooting Scene

A Seattle police news release said the officer came upon an Acura with its engine running and hood up. Stopping to investigate, the officer discovered the car to be stolen.

While doing paperwork in his patrol car, the officer saw a man approaching the driver's side of the cruiser from behind, police said.

Seattle Police Department Assistant Police Chief Jim Pugel said the officer got out of his car, immediately recognized Clemmons and ordered him stop and show his hands.

The news release said Clemmons refused to comply, and as the officer was drawing his gun, Clemmons reached into his waist area.

"He wouldn't stop," Pugel said. "The officer fired several rounds and took the person into custody."

Seattle Fire Department medics pronounced Clemmons dead at the scene.

Authorities said Clemmons was carrying a handgun stolen from the body of one of the slain Lakewood officers.

Police said the suspect had an old wound apparently received during Sunday's gunfight. Though the wound was bandaged, it appeared he had not received professional medical treatment.

KIRO 7 News reporter Kevin McCarty said so far, five people have been arrested for allegedly helping the suspect elude authorities during the massive two-day manhunt. One of those arrested is accused of driving the getaway car used in the officers' shootings. McCarty said that person could be charged with first-degree murder in the case. Full story See video

More arrests are expected.

"We expect to have maybe six or seven people in custody by the day's end," said Troyer. "Some are friends, some are acquaintances, some are partners in crime, some are relatives. Now they're all partners in crime."

Those people gave Clemmons medical aid, cell phones and helped to hide Clemmons in a continuing effort to throw police off Clemmons' track, Troyer said. Full story

Relatives who spoke to KIRO 7 denied the accusations.

On Monday, officers detained a sister of Clemmons who they think treated the suspect's gunshot wound.

"We believe she drove him up to Seattle and bandaged him up," Troyer said.

The Seattle shooting came just hours after police and SWAT teams busted into a Renton duplex Monday evening where Clemmons' niece lives.

Clemmons' niece, Destiny Hinton told KIRO 7 in an exclusive interview that she hasn't seen her uncle in at least a month.

Hinton said police were searching the wrong place when they broke a window and burst into her neighbor's apartment.

Video shown on KIRO 7 showed broken furniture, glass and various items strewn across the floor inside the apartment.

Authorities said Clemmons singled out the Lakewood officers and spared employees and other customers at a coffee shop Sunday morning in Parkland, a Tacoma suburb about 35 miles south of Seattle.

Lakewood police identified the officers killed as Ronald Owens, 37, Tina Griswold, 40, Greg Richards, 42, and 39-year-old Mark Renninger. Photos Of Slain Lakewood Police Officers Donate To Officers' Families WATCH IT: Moving Tribute At Lakewood PD

A memorial to honor the four Lakewood officers will be held at the Tacoma Dome next Tuesday. Full story.

A couple dozen police officers milled around at the scene where Clemmons was shot.

Video from Chopper 7 showed the stolen vehicle, a silver Acura Integra, with its hood up, doors open and engine running at the investigation scene.

Police said they aren't sure what prompted Clemmons to shoot the officers, but his behavior was described as increasingly erratic in the past few months. He had been arrested earlier this year on charges that he punched a sheriff's deputy in the face.

Troyer told the Tacoma News-Tribune that Clemmons indicated the night before the shooting "that he was going to shoot police and watch the news."

Police surrounded a house in a Seattle neighborhood late Sunday following a tip Clemmons had been dropped off there. After an all-night siege, a SWAT team entered the home and found it empty.

But police said Clemmons had been there.

Police frantically chased leads on Monday, searching multiple spots in the Seattle and Tacoma area and at one point cordoning off a park where people thought they saw Clemmons.

Authorities found a handgun carried by the killer, along with a pickup truck belonging to the suspect with blood stains inside.

They posted a $125,000 reward for information leading to Clemmons' arrest and alerted hospitals to be on the lookout for a man seeking treatment for gunshot wounds.

Authorities in two states were criticized amid revelations that Clemmons was allowed to walk the streets despite a teenage crime spree in Arkansas that landed him an 108-year prison sentence. He was released early after then-Gov. Mike Huckabee commuted his sentence.

Huckabee cited Clemmons' youth in granting the request. But Clemmons quickly reverted to his criminal past, violated his parole and was returned to prison. He was released again in 2004.

"This guy should have never been on the street," said Brian D. Wurts, president of the police union in Lakewood. "Our elected officials need to find out why these people are out."

Huckabee said on Fox News Channel's "The O'Reilly Factor" Monday night that Clemmons was allowed back on the street because prosecutors failed to file paperwork in time.

Pulaski County Prosecutor Larry Jegley, whose office opposed Clemmons' parole in 2000 and 2004, said Huckabee's comments were "red herrings."

"My word to Mr. Huckabee is man up and own what you did," Jegley said.

Clemmons was charged in Washington state earlier this year with assaulting a police officer and raping a child, and investigators in the sex case said he was motivated by visions that he was Jesus Christ and that the world was on the verge of the apocalypse. Full story

But he was released from jail after posting bail with the assistance of Jail Sucks Bail Bonds.

Documents related to those charges indicate a volatile personality. In one instance, he is accused of gathering his wife and young relatives and forcing them to undress.

"The whole time Clemmons kept saying things like trust him, the world is going to end soon, and that he was Jesus," a Pierce County sheriff's report said.

Clemmons has a lengthy criminal history. Full story See video

On Monday, Lakewood city officials said the shootings of their police officers was a horrific act of senseless violence. Full story and video

The remains of the slain officers were taken from the crime scene Sunday evening in a somber procession witnessed by thousands of people. SLIDESHOW: Police Procession For Slain Officers

TIMELINE: 4 Officers Gunned Down In Parkland SLIDESHOW: Images From Parkland Scene VIDEO BACKSTORY: Stream Of Mourners Build Massive Memorial UNCUT: Attack 'Clearly Targeted At Police' UNCUT: Chopper 7 Over Shooting Scene WATCH IT: Disbelief, Sadness Surrounds Shootings

Anyone with information about the case should call 866-977-2362, a special line set up for this case. Pierce County has activated its Emergency Operations Center, and has people staffing the call center to take calls.

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