A suspect linked to a series of murders in Arizona in recent days has killed himself after being surrounded by police at a motel.

Police were trying to make contact with the suspect at the Extended Stay Hotel in Scottsdale on Monday morning when he opened fire on them from his room.

Authorities said they gassed the motel room and sent in a robot where they found the suspect had fatally shot himself.

Law enforcement sources identified the suspect as 56-year-old Dwight Lamon Jones, ABC News reports.

While police have not yet confirmed a motive, sources told NBC the shootings may be linked to his bitter divorce from his wife.

Court records show his wife filed for divorce in 2009 but the case dragged on until last year due to various elements, including child support.

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A suspect who may be linked to a series of murders in Arizona in recent days was surrounded by police at the Extended Stay Hotel in Scottsdale on Monday morning (above)

Police were trying to make contact with the suspect at the motel when he opened fire on them

Police said they were in the process of evacuating the surrounding rooms when the suspect started shooting. No officers returned fire, according to Phoenix police Sgt Vince Lewis.

The hotel raid came after authorities identified a fourth professional found fatally shot in the three-day span of killings.

Authorities say they have strong evidence that links the killings of a Jonbenet Ramsey forensic psychiatrist on Thursday, two paralegals on Friday and the death of a hypnotherapist on Saturday.

Police released this sketch of the suspect in the first of three shooting deaths in Arizona. Authorities are investigating if a fourth homicide was also related

Dr Steven Pitt, a prominent forensic psychiatrist who assisted in high-profile murder cases including the JonBenet Ramsey mystery in Colorado and a notorious Phoenix serial killer investigation, was found the first victim found dead near Scottsdale on Thursday.

Witnesses reported hearing a loud argument and gunfire outside Pitt's office.

It has since emerged that Pitt had carried out a court-mandated mental health test on Jones in the early years of his divorce battle.

Police said the killings Friday of paralegals Veleria Sharp, 48, and Laura Anderson, 49, at a law office were related to the Pitt shooting, but were still trying to determine exactly what linked the three victims.

The two women worked at the law firm of an attorney who represented Jones' wife in their divorce case.

A fourth professional, Marshall Levine, was found shot inside a Scottsdale office building shortly after midnight Saturday. The 72-year-old worked as a hypnotherapist and life coach. He also provided marriage and divorce counseling.

Jones had been seeing a therapist at the same office building but it isn't yet clear if he was Levine's patient.

Law enforcement sources told ABC News that police gassed the motel room and sent a robot. Police said once the robot entered they found the suspect had committed suicide

Police surround the hotel where the suspect wanted in multiple killings was staying on Monday morning

Officers remained at the scene on Monday following the suspect's death after he shot himself when police closed in

Police had earlier said Pitt's killer was described as a bald man wearing a dark-colored hat with a short brim. They released a sketch of the suspect.

Sharp and Anderson were shot Friday inside a law office. Police say one of the women managed to walk to an intersection to seek help despite a gunshot wound to her head. She was taken to a hospital where she died.

Officers followed a blood trail back to the office and found the other woman. She was pronounced dead at the scene.

In the Levine case, Scottsdale police received a call Saturday about a man found fatally shot inside an office. Hoster did not identify the caller but said the person knew the victim.

The killing occurred in an office park that houses mostly therapists and counselors.

Pitt, the first victim to be killed, had assisted in the investigation of the 1996 death of six-year-old JonBenet Ramsey, who was found dead at her home in Boulder, Colorado.

A decade later, he helped Phoenix police in the Baseline Killer investigation as they sought a man who was later convicted of killing nine people.

Dr Steven Pitt, a prominent forensic psychiatrist who assisted in high-profile murder cases including the JonBenet Ramsey mystery, was found dead near Scottsdale on Thursday

Veleria Sharp (left) and Laura Anderson (right) were shot dead on Friday at the law office where they work, which focuses exclusively on mediation and family law litigation