update from deseret news describing the killer:
'A good boy'
Investigators were trying to learn more about the man responsible for causing the tragedy. Burbank said Talovic's car was searched, but the chief would not discuss whether evidence was found. He also did not say if any suicide notes were left or messages were posted on the Internet that might provide insight.
On Tuesday morning, police detectives were in South Salt Lake, questioning employees at the Aramark Uniform Supply business where Talovic had worked since December. Aramark managers and a company spokeswoman declined to comment. One employee described Talovic as "quiet."
Police said Talovic had a juvenile record of only four minor offenses. None of his arrests were for violent crimes.
The man had lived at a house with his mother and three younger sisters near the Utah State Fairpark. Neither his mother nor his sisters would answer the door or respond to phone calls Tuesday, although a person inside would pick up the phone and then quickly hang up.
Ajka Omerovic, who said she was Talovic's aunt, visited the home Tuesday afternoon. She told the Deseret Morning News that Talovic had been "a good boy." She said the family are Muslims from Bosnia who had lived in the vicinity of Sarajevo.
Omerovic said she believed the young man's mother had been living here for about four years. Omerovic was extremely distraught and at first said she did not speak English. But she did try to conduct an interview. She and a younger man went inside the home and left with a large cage with two birds in it.
"We want to know what happened, just like you guys," Omerovic told reporters. "We have no idea.... We know him as a good boy."
Asked what he was like, she replied, "He liked everybody, so I don't know what happened."
His mother is in "a difficult situation she is very sick," she added.
A loner
Many neighbors said that while the mother and young girls were always pleasant and the girls often played with other neighborhood children, Talovic kept to himself.
"I don't even know that there is a man living there," said neighbor Yasmin Castellanos.
Castellanos said police and an ambulance arrived at the house about 5 a.m. Tuesday.
Neighbor Riana Yellowbear said the few times she'd see Talovic walk by, he would never say anything. Another neighbor, John Buddensick, said he also rarely ever saw Talovic.
"I never would have expected anything like that at all," he said. "He was really quiet. He'd just walk in and out."
One of Talovic's former teachers remembered him as a loner who "didn't have any friends in class."
"I just remember a quiet kid, " said Danny Schwam, Talovic's former ninth-grade teacher at the Highland High-Garfield alternative program. "He didn't cause any trouble. He was kind of unassuming. He never acted out."
Schwam said Talovic only came to school about half the time. When Schwam called his mother to discuss the repeated absences, he said, "I usually got, 'He's sick."'
"It's always these kinds of kids," Schwam said. "It's the kids who are distraught, who have nothing to live for...who cause the most severe damage. They don't know what else to do. In their mind, they're at the end of their rope."