Boston (CNN) A jury on Tuesday found Bampumim Teixeira guilty of first-degree felony murder in the slayings of two doctors found lying in pools of blood in their Boston penthouse in May 2017.

Teixeira, a 33-year-old who had worked as a concierge in the building, was convicted of fatally stabbing 39-year-old Lina Bolanos and her 48-year-old fiancé Richard Field, both well-known anesthesiologists. He was also found guilty of armed robbery, kidnapping and home invasion.

The case stood out for its startling gore and unclear motive. Both doctors had been beaten and their hands had been bound, according to trial testimony. The words "payback" and "he killed my wife" were scrawled on the wall in large letters, and officers found photos that were crossed out and marked, a detective testified

Prosecutors questioned nearly 30 witnesses during the trial, including family and friends of the doctors, first responders and investigators. Teixeira's defense did not present any evidence but challenged the credibility and accuracy of the police investigation.

Teixeira claimed in an interview with police after the killings that he'd been in a relationship with Bolanos, that Field killed Bolanos in a rage after finding her with Teixeira and that Teixeira killed Field in self-defense.

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