EXCLUSIVE: Juror speaks out after convicting Elizabeth Holmes

Elizabeth Holmes trial juror Wanye Kaatz told ABC News he thinks Holmes "still believes" in her dream.

By the end of day three of deliberations in the Elizabeth Holmes trial, the jury had already decided to find the fallen Theranos founder guilty of defrauding investors who had poured millions of dollars into the Silicon Valley blood-testing startup, according to one juror who spoke with ABC News in an exclusive interview.

And yet, the group grappled for several more days over whether to convict or acquit Holmes -- who faced 11 counts of fraud -- on three other counts also related to investors, juror No. 6, Wanye Kaatz, said.

"We were very saddened. We thought we had failed," Kaatz, 64, said, referring to the moment when, hours before the jury announced its verdict on Monday, he and his fellow jurors sent the court a note that they had reached an impasse on those three counts.

Judge Edward J. Davila instructed them to continue deliberating, but by Monday afternoon, the eight men and four women maintained they still could not come to a unanimous consensus. At around 4 p.m., after seven days of deliberations, spanning two weeks, which included Christmas and New Year's, the jury convicted Holmes on four counts of fraud against investors. They found her not guilty on four other counts, regarding patients who took Theranos blood tests. A mistrial was declared on the counts on which the jurors could not agree.