George Sodini went to a sprawling L.A. Fitness Club on Tuesday night, turned out the lights on the "Latin impact" dance-aerobics class for women, and opened fire with three guns, spraying dozens of bullets before committing suicide.
"He just had a lot of hatred in him and (was) hell-bent on committing this act, and no one was going to stop him," Allegheny County Police Superintendent Charles Moffatt said Wednesday.
Meanwhile, CBS station KDKA reports that sources now say the Sodini called his mother minutes before the shooting.
His 4,610-word Web diary appeared to be a nine-month chronology of his plans to end his misery with a shocking act of carnage at his gym. He couldn't understand why women ignored him, despite his best efforts to look nice. He wrote that he hadn't had a girlfriend since 1984, hadn't slept with a woman in 19 years.
"Women just don't like me. There are 30 million desirable women in the US (my estimate) and I cannot find one. Not one of them finds me attractive," the 48-year-old computer programmer lamented.
, frustrated with women - Sodini began planning the murders at the gym, reports CBS News correspondent Susan Koeppen.
It was unclear when the Web diary was posted and whether it had been updated online repeatedly since November or posted in its entirety recently.
Two undated videos, apparently recorded by Sodini, surfaced on the Internet and are posted on Starcasm.net. In one, he tours his suburban Pittsburgh home, starting outside and moving inside the two-bedroom, brick rancher.
In the other clip, titled "Hide from Emotion," Sodini says "It is easy for me to hide my emotions for one more day." He continues, saying his objective is to "be real, learn to be more emotional … and to be able to emotionally connect with people."
During the tour, he points out his computers, living space and a basement where he highlights his handy work, hanging paneling and a suspended ceiling. Sodini notes that a sofa and chair in his living room match and says, "women will really be impressed." He also focuses on reading material on a table that include a books titled "Date Young Women" and a paper with "Office Politics" printed on the front.
Moving through the home, he talks about a newly purchased dining room set, and shows his bedroom, which includes a bed, computer and a dresser.
"It looks pretty clean," he said. "I'm sure she'll be impressed."
Speaking to the camera in the second video, Sodini talks about hiding his emotion, how he thought he had 15 years remaining and how his objective his to "be real and be emotional" and to be able to "emotionally connect with people."
He speaks about how, in a relationship with a woman 10 to 20 years younger, "she has to feel good about this thing."
On CBS' "The Early Show" Thursday, Sodini's neighbor Patricia Cowen said her daughter was once the subject of the shooter's diary. In one entry dated July 23, 2009, Sodini says he noticed Cowen's daughter outside and
"It's just so overwhelming," Cowen said. "Just the idea of someone like that, thinking like that."
However, up until this week, Cowen said she considered Sodini a happy, quiet man and trustworthy. "I would have left him in my house anytime," she said.
Another neighbor, Connie Fontanesi, though, said Sodini was so anti-social that "we really didn't learn anything personal about him."
The health club violence rocked the town of about 5,300 people just outside Pittsburgh.
Killed were Heidi Overmier, 46, of Carnegie, a sales manager at an amusement park; Jody Billingsley, 37, of Mount Lebanon, who worked for a medical-supply company; and Elizabeth Gannon, 49, of Pittsburgh, an X-ray technician at Allegheny General Hospital.
"She can't be gone," said Gannon's next-door neighbor and close friend, Carl Rady, who knew her for 35 years and said she loved to work out and pamper her dog. "It can't happen that way."
Patricia Cowen lived across the street from Sodini for 12 years, and told the CBS "Early Show" on Thursday that it was "really devastating" to find out about the shootings and the online journal. Asked whether he ever seemed disturbed, she said no.
"He seemed pretty focused on life," Cowen said. "He seemed happy.
"I felt like he was just a loner who liked to keep to himself. He would say 'Hi' on occasion. I just never thought that someone like that would be so capable of what he's done."
Six patients remained hospitalized, including the aerobics instructor, Mary Primis, 26, who was listed in fair condition. Primis is pregnant but said doctors told her the baby is fine.
Sodini did not have a relationship with any of his victims, according to police.
In his Web diary, Sodini wrote of planning the attack since at least November and said he tried to carry it out when the same weekly aerobics class met Jan. 6 but "chickened out," he wrote.
His anger stemmed from unfulfilled desire: The women at his gym "look so beautiful as to not be human," he wrote. He complained that women "don't even give me a second look ANYWHERE" even though he was tan and fit and claimed to dress well and smell nice.
He listed his status as "Never married." In a chilling addition, he recorded the date of his death as Aug. 4, 2009.
Sodini did not have a criminal record, and he legally bought the guns he used, police said.
Sodini's family issued a brief statement: "Our hearts and prayers are with the victims and their families and we pray for the full recovery of the survivors."
Sodini graduated in 1992 from the University of Pittsburgh with a degree in computer science and had worked as a systems analyst at a Pittsburgh law firm since 1999.