Jury in Boston bombing shown images injuries

Dzhokhar Tsarnaev admits planting the bombs but claims he acted under brothers influence. Picture: AP

One juror cried and wiped her face with a tissue as the jury looked at autopsy photos and listened to the description of injuries suffered by Krystle Campbell. Judge George O’Toole jnr would not allow the photographs to be shown on public monitors – only the jurors saw them.

Ms Campbell, a restaurant manager, was one of three people killed when twin pressure-cooker bombs exploded near the finish line of the marathon on 15 April, 2013. More than 260 people were injured, including at least 16 who lost legs.

Tsarnaev’s lawyer admitted during opening statements at his federal trial that he participated in the bombings but said he fell under the influence of his late older brother, Tamerlan, whom the defence has portrayed as the mastermind of the attack.

Dr Jennifer Hammers, the medical examiner who performed Ms Campbell’s autopsy, said she had wounds all over her body, including gaping wounds to her legs, third-degree burns to her back and numerous wounds from pellets and shrapnel. She said she removed numerous metal fragments embedded in Ms Campbell’s wounds.

“Many of them were very deep, through the whole surface of the skin into the muscle,” Dr Hammers said.

Ms Campbell bled to death – but not immediately, Dr Hammers said.

“Based on those injuries, you would estimate that she could have lived for up to a minute?” asked assistant US attorney William Weinreb.

“That’s correct,” Dr Hammers responded.

On Monday, prosecutors plan to call two other medical examiners to testify about the deaths of eight-year-old Martin Richard, a Boston boy who was with his parents, sister and brother at the marathon, and 23-year-old Lingzu Lu, a graduate student at Boston University.

After that testimony, prosecutors are expected to rest their case in the first phase of the trial, the guilt phase.

Then the defence will present its case, which is expected to be brief since Tsarnaev’s lawyers have admitted his guilt. During the second phase of the trial – known as the penalty phase – the same jury will decide if Tsarnaev is sentenced to death or spends the rest of his life in prison.

Tamerlan Tsarnaev, 26, died days after the attacks when he was wounded during a gunbattle with police and run over by Dzhokhar as he escaped. Dzhokhar was found more than 18 hours later, hiding in a boat parked in a yard in Watertown. In other testimony an FBI bomb expert said the pressure-cooker bombs used in the attack were not difficult to build, using readily available parts and instructions found on the internet.