In the moments before his death, Richard Field sent eight desperate text messages.

“Call 111,” he wrote to Matthias Heidenreich around 7:30 p.m.

The messages that followed said:

“Gun man.”

“In house.”

“Serious.”

“Serious.”

“Serious.”

“Serious.”

“Serious.”

Heidenreich, a friend of Field and his fiancee, Lina Bolaños, returned home from CVS to find them waiting, unread, on his phone. By then, though, it was too late.

“I was confused for the first minutes,” Heidenreich, a scientist for Vertex Pharmaceuticals, testified Friday in Suffolk County Superior Court. “At some point, I realized what it could mean.”

When Field didn’t respond, Heidenreich and his girlfriend called the concierge at Macallen Building, where the doctors lived, before taking an Uber to their South Boston apartment, the Boston Herald reported. Police officers got to the scene before they did.

Field’s body laid crumpled in his own blood when police found him on May 5, 2017, with his arms bound behind his back. Bolaños had been stabbed to death several feet away, in another bedroom in their penthouse.

Their assailant, chief trial counsel John Pappas said in his opening statement Thursday, was Bampumim Teixeira, who briefly worked as a security guard at the building on Dorchester Avenue.

When officers arrived at the scene on May 5, around 8:40 p.m., a man started shooting at them. Police returned fire and struck the 32-year-old from Chelsea, Mass., who was taken into custody and treated at a hospital. Authorities recovered a carving knife and bag filled with Bolaños’s jewelry inside the apartment.

A grand jury indicted Teixeira on two counts each of first-degree murder, armed robbery, and kidnapping, and one count of armed home invasion. If convicted, he faces life in prison without the possibility of parole.

In the first days of the double-murder trial, jurors heard testimony from witnesses including Field’s brother and the doctors’ next-door neighbor, who heard gunshots and called 911. According to the Herald, the operator told her officers were already dispatched. They had received several hang-up emergency calls from the victims’ apartment.

Prosecutors said that surveillance footage captured Teixeira “lurking” near the building around 4 p.m. Bolaños, a 38-year-old pediatric anesthesiologist at Massachusetts Eye and Ear, returned home from work about an hour later. Field, a 49-year-old physician at North Shore Pain Management, came home at 6:30 p.m.

Jurors also heard from the property manager who testified about the building’s security procedures. CBS News reported that the families of Field and Bolaños filed a wrongful-death lawsuit against the building alleging a lapse in security.

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