Jose Ibarra's defense has raised questions about whether his two brothers may have been responsible for the killing.

Day 3 of the murder trial of Jose Ibarra in the killing of nursing student Laken Riley featured 10 prosecution witnesses and 3 defense witnesses as the trial moved at a quick pace.

Here are some of the key takeaways from Tuesday's testimony:

Riley's last run caught on camera: Surveillance video near a running trail and bus stop on the University of Georgia campus showed Riley out on a run at about 9 a.m. minutes before her death on the morning of February 22. The video also captured a man dressed in dark clothing lingering in a nearby area about an hour earlier.

Victim's heartbreaking final text: Riley's last text on her phone was a message to her mother hoping to talk. "Good morning, about to go for a run if you're free to talk," she wrote to her mother at 8:55 a.m. Her mother repeatedly called back over the next few hours but did not reach her daughter.

Riley's cause of death: Her cause of death was the combined effects of blunt-force head trauma and asphyxia, a medical examiner testified. Riley had a skull fracture and a series of injuries to her face that "could be consistent with a rock," the examiner said.

DNA matches defendant: Fingernail clippings of Riley's right hand were linked to the genetic profile of Jose Ibarra, a forensic DNA expert testified. In addition, a blood-like stain on a navy blue jacket found in a dumpster contained the DNA of Riley and Ibarra, the expert testified.

Prosecution rests: The prosecution rested its case after calling about 25 witnesses over three days.

Defendant declines to testify: Speaking through a translator, Jose Ibarra confirmed he understood his rights and did not want to testify.