Peterson's murder trial follows years of acrimony

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FILE - In this undated file photo provided by the Stacy Peterson family, Stacy Peterson, 23, right, of Bolingbrook, Ill., is seen with her younger sister Cassandra Cales. Peterson, the wife of Drew Peterson, a sergeant with the Bolingbrook Police Department, was reported missing Oct. 29, 2007. On Tuesday, July 31, 2012, opening statements are slated in the much-anticipated trial of the 58-year-old Peterson, who was charged with the 2004 murder of his 40-year-old third wife, Kathleen Savio, only after his fourth wife, Stacy Peterson, vanished without a trace in 2007. Many Savio family members are potential witnesses and so can't speak publicly about the case or sit in on testimony. But Cales, one of the most outspoken members of Stacy Peterson's family, said she will be at the Will County courtroom as the trial starts in earnest. (AP Photo/Courtesy the Stacy Peterson Family, File)

CHICAGO (AP) — The start of testimony in Drew Peterson's murder trial comes in the wake of public acrimony between the former Chicago police officer and relatives of his former wives.

Attorneys deliver opening statements Tuesday. Jurors will decide if the 58-year-old killed his third wife, Kathleen Savio. He's also suspected in the disappearance of his fourth wife, Stacy Peterson.

Many Savio family members are potential witnesses, so can't speak publicly.

An outspoken member of Stacy Peterson's family, younger sister Cassandra Cales, tells The Associated Press she can barely sleep because she's so anxious about the trial.

After Drew Peterson's 2009 arrest, Cales told reporters it was good to see him chained up, in her words, "like the dog that he is." Peterson has tried to paint the Stacy Peterson family as troubled.