He questioned what causes a man to commit "unspeakable acts" on Burghardt, a woman with a troubled mental history who was trying to put her life back together; on Schmoyer, a girl whose life revolved around family and school activities; and on Fortney, who walked her granddaughter to school and helped her daughter run a household.
Steinberg said Robinson is more than a predator. Looking into the eyes of the young man, who blinks incessantly, one sees wickedness, cruelty and evil, the prosecutor said.
Robinson didn't know any of the victims, who lived in the neighborhood near his home at 709 N. Kearney St. Prosecutors speculated that he may have stalked his victims before deciding when to strike.
No one knows how and why he chose these particular victims.
Robinson did not take the stand in his 12-day trial.
Carmen Marinelli, one of Robinson's court-appointed lawyers, said the state's case had huge gaps, and prosecutors used a smoke screen to hide a lack of evidence. Prosecutors had no murder weapons, no motive, no eye witnesses and no finger prints, he said.
Marinelli asked the jury to acquit Robinson of all the charges. "They haven't proved it," he said. "It just is not here."
The prosecution's strongest evidence came in the Schmoyer killing.
Prosecutors found a hair on the girl's sweatshirt and another on her knee that experts said are consistent with Robinson's head and pubic hair.
A blue car with passenger side damage had been seen in a parking lot at the East Side Reservoir the morning Schmoyer's body was found there in dense woods. Witnesses said Robinson had been seen driving his mother's blue Ford Tempo with side damage.
Steinberg said Robinson was calculating and cunning and did not leave finger prints because he wore gloves.
Marinelli attacked the reliability of the one piece of evidence that linked Robinson to all three murder victims -- results of FBI tests that compared DNA in Robinson's blood to DNA in semen.
One of the state's experts defended the accuracy of the scientific tests and said the genetic components in Robinson's blood matched those in semen taken from two of the bodies and from a pair of shorts belonging to a third victim. Based on the tests, there is a one in a billion chance that Robinson is not the killer, according to an FBI agent who reviewed results of the tests.
Marinelli said the DNA evidence was suspect, but Steinberg noted that the defense did not call its own expert to rebut the state's DNA results.
In all three cases, the DNA in semen matched Robinson's DNA, the prosecutor said.
Steinberg said the case was put together by ranking and uniformed police officers trained to spot morsels of evidence, people in the community who were able to testify about minor details that contributed to the overall case, courageous family members of the victims who had to identify belongings of their loved ones, expert witnesses and science.