Deadly Delivery: The Donald and Marsha Levine Murders

The prosecution also called a jailhouse snitch who said Levine confessed to the murders while incarcerated awaiting trial. John Rinaldo, who was in jail for money laundering and bank fraud, quoted Levine as saying that had McKinney "kept his mouth shut" he wouldn't have been in any trouble, according to the Tribune.

The defense was left trying to debunk the prosecution's theory by challenging the credibility of both McKinney and Rinaldo and then blaming the murders on Mark Levine. Attorney Kevin Milner attempted to show on cross examination that McKinney had lied about being a decorated Vietnam War veteran and that Rinaldo used aliases and had a history of fraud-related convictions. Rinaldo also passed himself off as a lawyer, Milner said.

But the main portion of the defense's case focused on Mark Levine, who, Milner argued, had the most to gain financially from his parents' murders. The judge let Milner call the polygraph examiner to the witness stand to testify about Mark's inconclusive test. In addition, detectives had given Mark a second test four months before trial with the same result.

Another witness was Mark's grandmother, who testified that Mark had sued her upon learning he was not in her will. The lawsuit had been geared toward discovering the assets she held, his grandmother testified.

Then the defense called the neighbor witness, who testified that Mark had run from the house after the gunman left, not before. All of this was meant to suggest that Mark, rather than Robert, had hired McKinney.

However, the jury didn't buy it. They convicted Robert Levine on murder and conspiracy charges after 12 hours of deliberations.