Parkland school shooter's AR-15 rifle shown to jurors in penalty trial

Assistant State Attorney Mike Satz checks the weapon used in the Marjory Stoneman Douglas High School shooting into evidence, during the penalty phase of Nikolas Cruz's trial at the Broward County Courthouse in Fort Lauderdale, Florida, on July 25, 2

Jurors in the penalty trial of Florida school shooter Nikolas Cruz got their first view Monday of the AR-15-style rifle he used to murder 17 students and staff members four years ago at Parkland's Marjory Stoneman Douglas High School, staring intently as it was carried to the front of the courtroom.

Lead prosecutor Mike Satz removed the black semi-automatic Smith & Wesson from a cardboard box and carried it to Broward sheriff's Sgt. Gloria Crespo, who said it was found in a third-floor stairwell after the Feb. 14, 2018, massacre. Video seen by jurors previously showed Cruz placed it on the landing along with his backpack and the black shooter's vest he had been wearing before fleeing the school.

The defense objected to the weapon's introduction, saying without explanation that it lacked relevance and was unfairly prejudicial. The defense also objected to Satz placing the gun on the floor behind him in easy view of the jurors instead of placing it on an evidence table away from them. Circuit Judge Elizabeth Scherer rejected the objections.

David S. Weinstein, a Miami criminal defense attorney and former prosecutor who is not involved in the case, said the defense believes that since Cruz pleaded guilty, the gun and other evidence such as surveillance video and crime scene photos are no longer relevant and serve to inflame the jurors' emotions.

Prosecutors have successfully argued that such evidence is necessary to prove the murders included at least one aggravating factor such as being committed in a cruel or heinous manner or during a crime that endangered the lives of many people.

Crespo also testified that Cruz, then 19, had five gun magazines remaining in the vest, containing 160 total bullets. He had fired more than 100 shots as he stalked the three-story building for seven minutes, firing down hallways and into classrooms. The former Stoneman Douglas student, who had been expelled a year earlier, wounded 17 in addition to the 14 students and three staff members.

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The jurors also were shown photos Crespo took of the bodies of five students and a teacher who died on the third floor, all shot at close range, and photos from three autopsies. Those were not shown to the gallery, where several parents and family members sat, but were later shown to reporters in private. As most mass shooters die during their attacks and aren't brought to trial, it is rare that such photos are seen outside of law enforcement.

The crime scene photos show two girls and one boy lying dead next to each other in the hallway, a Valentine's Day stuffed animal next to one girl's head. One boy lying nearby was shot 12 times, including four times in the head. His autopsy photos showed gaping wounds to his skull and shoulder — one female juror wiped away tears as those were shown.

The parents of one boy and the wife of a staff member wept as the doctors discussed their family member's autopsy. Members of other families grasped their hands and rubbed their shoulders, then hugged them when the session ended.

This showing came three days after prosecutors showed jurors photos of the horrific damage the bullets fired by Cruz's AR-15 rifle did to some of his victims, causing extensive wounds to their heads, bodies and limbs. The jury also saw gruesome crime scene photos showing victims who died in their classrooms, some falling on top of each other. It was an unusually graphic display in a U.S. courtroom as most of the nation’s mass shootings never reach trial because the killer dies during or immediately after the attack.

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The seven-man, five-woman jury and 10 alternates showed little emotion as the photos from the Parkland school were displayed on video monitors inside the jury box. They were not shown in the gallery, where several parents sat, but were shown to reporters after the hearing.

Prosecutors said they were showing the photos because they believe their graphic and horrific detail demonstrates the heinous, depraved and cruel nature of Cruz’s actions. The defense unsuccessfully objected to their showing, arguing that they are only meant to inflame jurors’ emotions.

Dr. Iouri Boiko, the medical examiner who did the four autopsies shown Friday, said the biggest and most gruesome wounds appeared where high-speed bullets fired by Cruz’s semi-automatic rifle exited the body. One girl had her head blown open, while another had the front of her right shoulder blade missing. Another was missing most of a forearm and bicep from three wounds. The Associated Press is not naming specific victims’ autopsy findings to protect their families’ privacy.

RELATED: Parkland school shooter trial: Jurors see video of Nikolas Cruz's 'cold, calculated and cruel' rampage

Boiko said one girl would have died from a bullet that grazed the top of her head as the shock wave fractured her skull, causing extensive brain damage. She also suffered a fatal wound through her chest. Most of victims were shot multiple times.

Photos of bodies inside classrooms included one boy bent backward over his seat, his body almost forming a U-shape. Blood pooled beneath him.

Some victims’ parents held their heads as they listened to the doctor’s descriptions, while one family walked out.

Earlier Monday, the seven-man and five-woman jury and their 10 alternates heard from Uber driver Laura Zecchini, whom Cruz hired to drive him to the school. She said he appeared nervous during the 13-minute ride and was carrying a large black soft-sided carrying case. Cruz told Zecchini he was going to his music lesson.

Cruz pleaded guilty in October to 17 counts of first-degree murder, so the jury will only decide if he is sentenced to death or life without parole.

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His is the deadliest mass shooting in U.S. history to reach trial. Nine U.S. gunmen besides Cruz who killed at least 17 people died during or immediately after their shootings, either by suicide or police gunfire. The suspect in a 10th, the 2019 slaying of 23 people at a Walmart in El Paso, Texas, is awaiting trial.

When jurors eventually get the case, probably in October or November, they will vote 17 times, once for each of the victims, on whether to recommend capital punishment.

For each death sentence, the jury must be unanimous or the sentence for that victim is life. The jurors are told that to vote for death, the prosecution’s aggravating circumstances for that victim must, in their judgment, "outweigh" the defense’s mitigators. A juror can also vote for life out of mercy for Cruz, now 23. During jury selection, the panelists said under oath that they are capable of voting for either sentence.