BRIDGEVILLE, Pa. -- Channel 11 News learned that gunman George Sodini called his mother before Tuesday night's Collier Township health club shooting that left three women dead and nine injured.

On Thursday, police said he called his mother to say, "I'm going to kill a bunch of people. I don't expect I'm going to survive this."

Friday, the Allegheny County Police Homicide Unit told Channel 11 News that Sodini did call his mother prior to the shooting, but did not tell her he was going to harm anyone or himself.

After calling her, Sodini went into the sprawling L.A. Fitness Club, turned out the lights on the Tuesday night "Latin impact" dance-aerobics class for women and opened fire, spraying dozens of bullets before committing suicide, police said.

Police are not providing any further information about the call or what, if any, response was made by Sodini's mother.

Sodini also left behind notes, YouTube videos, blog entries and a Web site, all of which provide insight into the shooting's planning and Sodini's mindset leading up to the attack.

Channel 11 News showed Sodini's YouTube videos and writings to forensic pathologist Dr. Cyril Wecht who provide his expert opinion regarding Sodini's behavior. He said Sodini felt inadequate, had been bullied as a child and picked on at home.

Wecht said Sodini was "a nerd to the nth degree" who suffered from a persecution complex.

---

VIDEO: Wecht Shares Criminal Profile Of Sodini
SLIDESHOW: Photos Of Suspect, Victims, Scene
BLOG: Read Text Of Suspect's Blog. WARNING: Blog Contains Graphic Language

---

"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 on Wednesday.

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 hadn't had a girlfriend since 1984, and 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.

The 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."

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.

On that evening, he walked into the health club wearing black workout gear and a headband, and entered the class with multiple guns.

Jordan Solomon, 14, said she thought it was weird when a man walked into the all-female class and put a black duffel bag on the ground and reached into it.

"All of a sudden all the lights went out and I turned around, he started firing. I turned around and I saw him holding a gun," she said. She ran out of the room and into the parking lot, bolting into a restaurant where she told the workers to call 911.

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.

A neighbor, Connie Fontanesi, said Sodini was so anti-social that "we really didn't learn anything personal about him."