Soon after opening statements, the prosecution began its case against federal agent Christopher Deedy with several witnesses taking the stand.
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Nearly two dozen witnesses took the stand in last summer's murder trial.
Attorneys involved in the case say to expect a number similar to that in this retrial.
On Thursday, prosecutors called up several witnesses, including some of Kollin Elderts friends who were with him the night he was fatally shot.
Malie Goodhue told jurors Elderts was acting normal that night despite having drinks. She then recalled the moment another friend, Shane Medeiros, told her what happened to Elderts early in the morning.
"He just kept saying, 'He's gone. He's gone,'" said Goodhue.
She also confirmed that Elderts had been consuming alcohol for seven hours.
Most of the players in this trial are the same as last time, including Judge Karen Ahn and Deputy City Prosecutor Janice Futa. But, Deedy's lead attorney is new.
Thomas Otake is taking over for Brook Hart who was on a limited consulting basis.
According to the prosecution, it does not plan to give jurors the option to consider a lesser charge of manslaughter and is instead focused on convicting Deedy of second degree murder like the last go-around.