Authorities offered nothing public about the man's possible motives, but they planned to discuss the case in more detail at a news conference scheduled for later Monday.
The first shooting death linked to 56-year-old Dwight Lamon Jones occurred on Thursday, when Dr. Steven Pitt was found shot and killed outside of his office building in Phoenix, and the victims in the latest shooting deaths were found dead in a Fountain Hills home on Sunday.
The raid came as police identified the fourth victim, Marshall Levine, a 72-year-old counselor and life coach.
Seargent Ben Hoster said of the victims, "We don't know the relationships or the connections".
Police said that the suspect's ex-wife and son were both unharmed.
In her statement released shortly after the police briefing, Connie Jones said that she was a source for the tip.
Police may have become interested in Jones when they were contacted by his ex-wife's current husband.
The Scottsdale Police Department had arrested Dwight Jones in 2008 on charges of domestic violence and threats, Slavin said.
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It took a hunch from a retired police detective to find a man suspected of fatally shooting six people in the Phoenix area.
ORIGINAL: 8:10 a.m. Police soon retrieved a small.22 caliber pistol from the can. For now, he said, the extended stay hotel is a crime scene. Pitt was brought on by Boulder police and the district attorney to consult on the case in February 1997. Police used DNA samples from Jones' relatives to make the match.
The status and financial comfort that Jones got from his marriage ended with the divorce, Rustigan said. She then ran out of the office and flagged down a party bus driver to call for help. Because Jones was seen near a home near East Kit Fox Place in Fountain Hills, but his association with the home wasn't known.
Sharp and Anderson were shot Friday inside a law office. It's unclear if they had any connection to the divorce.
"At this time, we don't have the same kind of linkage that we have with the other scenes".
"I personally fielded a lot of questions from those groups because they were concerned", said Sgt. Jones, now thought to have been the killer, was black.
Without psychiatric help, Jones "is going to continue to unravel", the doctor, Steven Pitt, testified, according to a 2010 court document from the divorce. He had sublet office space from a counselor who was ordered to see Jones' son during the divorce.
"He was willing to dedicate himself to this, and he put aside the risk to do what he did", she said.
The slayings went against the typical pattern of violence stemming from divorces by targeting professionals involved in the split rather than the ex-spouse, Levin said.
Lewis, the Phoenix police spokesman, said, "we are confident" that Levine's homicide is related to the other three.