The prosecution in People of the State of California vs. Johannes Mehserle has rested its case.

Former BART officer Mehserle has been charged with murder in the New Year’s Day 2009 shooting death of 22-year-old Oscar Grant. The trial was moved to Los Angeles last fall due to extensive publicity and concerns about the fairness of jurors.

Monday’s final witness was Sgt. Charles Spruill with the Vacaville Police Department in Solano County.

Spruill is an expert witness in group dynamics and crowd control techniques. Asked by Deputy District Attorney David Stein what officers should do if they see a fellow officer “losing control,” Spruill replied, “It’s important that we not make our jobs harder. We are responsible for each other. That’s basic learning. Cadets don’t leave the academy until they master this.”

Spruill is an instructor at the Napa Valley Academy Mehserle attended. He told the court he was not familiar with officer Anthony Pirone, Mehserle’s former co-worker.

Vicki Long, the Alameda County audio and video technician who testified during the first day of trial, was recalled to the stand to explain a synchronized version of the six videos used in the case. It was the first time Stein played the videos together.

The videos, shot by BART riders that New Year’s Day morning, and surveillance footage from the station all begin and end at disparate times. All of them, however, make for a somewhat coherent account of the events that led to Mehserle’s fatal shooting of an unarmed and prone Oscar Grant on the Fruitvale BART platform.

The surveillance footage shows a south-bound train pulling into the Fruitvale station, and passengers getting off and leaving the platform. After about four minutes, one group of passengers – later identified as friends of Grant – can be seen leaving the lead car as Pirone passes them. Pirone detained Carlos Reyes, Jackie Bryson and Nigel Bryson and told them to sit against a wall.

The video showed former officer Marysol Domenici arrive on the nearly empty platform to watch the three young men. Pirone can be seen walking alongside the train pointing his Taser at the window until he comes to an opening. Grant walked out, and Pirone escorted him to the wall where the others sat.

Although it is not captured on film, Pirone returned to the train to detain Michael Greer. Pirone grabbed Greer by his collar, took him off the train, threw him into the concrete wall, then slammed him onto the ground, according to witness testimony.

Witnesses then began turning on their digital cameras to record what they saw. The videos show Pirone assaulting Grant. Mehserle and his partner arrived on the platform. Mehserle shot Grant about two minutes later.

Morning testimony June 21 began with Keecha Williams, the BART train operator who received an intercom call about a fight aboard the train as she pulled into the Fruitvale station. The call came from a woman who was talking excitedly, Williams said.

A second call by a different rider came over the intercom, saying black males in black clothing were involved in the fight. Williams said she looked out her window and saw a group of black males and one Hispanic woman standing on the platform. One of the young men in the group, identified by Williams as Nigel Bryson, asked her if “5-0 was coming?” She nodded her head and the young man told the group they should leave.

Williams went on to contradict much of Pirone’s testimony. She said he never asked her if the young men he detained were involved in the fight; he never asked her who she thought was involved; and she said she never stated the young men placed against the concrete wall were the ones from the fight.

After Pirone detained Greer, Williams testified she received a third call over the intercom from a woman who asked that the train move or the doors be closed because she didn’t “want to get shot.”

Mehserle’s defense attorney, Michael Rains, is scheduled to present his case Tuesday, June 22, beginning with witness Alex Hidas, the San Leandro police officer who used a Taser on Grant in 2006.

L.A Times reporter Jack Leonard contributed to this report.

Coverage of the trial will continue on Oakand Local. See OL’s other coverage of the Oscar Grant case here. Follow on twitter @OscarGrantTrial.