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Closing arguments to start in trial of former Theranos President Sunny Balwani

A jury on Tuesday was scheduled to hear closing arguments in the trial of Ramesh "Sunny" Balwani, the former Theranos executive charged with teaming up with his secret lover, former CEO Elizabeth Holmes, to carry out a massive fraud.

The three months of testimony and evidence mirrored the case against Holmes in a separate trial last year. Holmes was convicted on four counts of defrauding investors and acquitted on four counts alleging she had also deceived patients who submitted to Theranos blood tests. 

Holmes, 38, is free on $500,000 bail but faces up to 20 years in prison and a $250,000 fine on each count, although under federal sentencing guidelines any prison terms would likely run concurrently, not consecutively. Balwani faces the same punishment if convicted. Holmes is awaiting sentencing in September

Lawyers for Balwani, 57, have depicted him as a well-intentioned investor and entrepreneur who became Theranos' chief operating officer in 2010 and then was swept into the scam by Holmes. She later dumped him as her lover and business partner in 2016 as Theranos began to unravel.

Widow of Theranos' former chief scientist speaks out following Elizabeth Holmes' conviction04:39

Before that fissure, Balwani put up $15 million of his own money to help bolster Theranos when Holmes brought him on board as her top lieutenant while they were clandestinely living together. Balwani's Theranos investment eventually became worth about $500 million on paper — a stake that his lawyers told jurors he never sold. It became worthless when the company collapsed.

Prosecutors have portrayed Balwani as a ruthless accomplice who helped Holmes swindle investors. At one point, they charged, Balwani, who has no medical degree, oversaw the Theranos lab that covered up serious flaws in a the company's blood-testing technology that could have jeopardized the lives of patients.

"Ms. Holmes and Mr. Balwani were partners in virtually everything," Prosecutor Robert Leach said in the early stages of the trial. "The defendant and Holmes knew the rosy falsehoods that they were telling investors were contrary to the reality within Theranos."

Holmes' bold claims for Theranos helped make her a Silicon Valley star — a rich one, too, with a paper fortune of $4.5 billion based on the company's success in fundraising and brokering business deals based on her promise that the company would revolutionize health care. Holmes claimed that the company had developed a technology that could scan for more than 200 potential health problems with a few drops of blood taken with a finger prick.

Impact of Elizabeth Holmes' guilty verdict on Silicon Valley01:48

Balwani began dating Holmes around the same time she started Theranos, and then began give her business advice. Their relationship was a focal point of a Hulu TV series, "The Dropout," about Holmes' rise and fall that was released shortly before the trial began, complicating efforts to pick an unbiased jury.

During her trial, Holmes took the witness stand and at one point tearfully accused Balwani of being a domineering figure in her life who subjected her to emotional and sexual abuse. One of Balwani's other attorneys vehemently denied those allegations during Holmes' trial. Balwani's lawyers have urged jurors in the current trial to discard anything they may have previously read or heard of Holmes' allegations.

There had been speculation that that Holmes might return to court to testify against Balwani during his trial, but it never happened. Unlike Holmes, Balwani opted against testifying in his own defense during his trial.

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