While police have said the killings appear to be related, it's unclear what connection Sharp and Anderson had to Pitt, if any.
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.
Hoster said investigators do not know yet whether Levine's death was connected to the others.
Less than 24 hours later, at about 2 p.m. Friday, two paralegals were shot inside a law firm in downtown Scottsdale, across the street from government offices.
The victims include famed forensic psychiatrist Steven Pitt, who was involved in several high-profile cases, including the investigation into the death of JonBenét Ramsey in 1996.
Earlier in the morning, police had determined the fatal shootings of Dr. Steven Pitt, Veleria Sharp, Laura Anderson and Marshall Levine were linked, citing ballistics. She was taken to a hospital and later pronounced dead.
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Lewis said police developed information that led them find the suspect over the past day and a half.
A man suspected in a string of killings in the Phoenix suburb of Scottsdale, Ariz., fatally shot himself as police closed in Monday, ending a days-long manhunt that has left many in the legal and mental health communities on edge.
Phoenix police say Pitt's killer was described as a bald man wearing a dark-coloured hat with a short brim. Police believe the suspect knew all of the victims, he added.
Officers followed a blood trail back to the office and found the other woman.
A SWAT unit made its way into the room, but officers said the man was already dead from an apparent self-inflicted gunshot wound.
The website of Burt/Feldman/Grenier, the law firm that employed Sharp and Anderson, says it practices divorce, child support and other aspects of family law. "She was more than a coworker, she was a friend, a mother, grandmother, daughter and wife and gave all of herself to her family, her friends and her work", Burt, Feldman, Grenier said. He first rose to prominence while working in Boulder, Colorado, when he was tapped by the district attorney Alex Hunter to help solve the murder of 6-year-old beauty queen JonBenet, which gripped the nation.