A judge released transcripts on Tuesday of previously sealed documents from the Christopher Deedy trial on the day the mistrial was declared.
The documents show the jury foreman noticed one of his fellow jurors shaking hands with someone who was later seen having lunch with family members of the victim or the defendant.
Judge Karen Ahn called in the foreman to ask questions then ultimately decided to bring in the juror in question.
That juror, whose name was redacted from the transcripts, said he only knew that person's first name and that he had no contact with that person after that brief encounter.
The juror said, "It was just hi, you know, long time no see."
The prosecution argued it was an innocuous handshake. However, the defense attorneys believed the judge should have made more inquiries into the relationship between the juror and the person whom he shook hands with.
The judge ultimately decided the juror was still impartial after asking questions about the handshake saying, "It's sufficient that the juror said that he can be a fair and impartial juror to both sides."
Members of the media sued to get these transcripts made public.
Later that day on Aug. 26, the judge declared a mistrial after the jury said it was deadlocked and could not reach a verdict.
Deedy's retrial is set for later this summer. The federal agent is accused of murdering Kailua native Kollin Elderts in a Waikiki McDonald's restaurant in 2011.
The judge and attorney involved also discussed how not to tip off the news media shortly before calling in the jury foreman about what he saw.