BOSTON (CBS) — A Chelsea man was ordered held without bail Monday as new information was revealed about the brutal killings of two engaged doctors in their South Boston luxury condominium earlier this year.

Bampumim Teixeira, 30, pleaded not guilty at his arraignment on an indictment in the murders of 38-year-old Dr. Lina Bolanos and 49-year-old Dr. Richard Field.

In court Monday, prosecutor John Pappas described how Teixeira had knowledge of the layout of the couple’s building because he was a security guard there briefly in 2016.

Pappas said Teixeira was seen lurking around the condominium complex at about 2:40 p.m. and in the garage around 4 p.m. on May 5, the day of the murders.

Bolanos returned home around 5 p.m. and Field around 6:30 that evening.

According to Pappas, Teixeira bound each of them with duct tape and used a large carving knife to kill them.

Police were called to the apartment around 8:38 p.m. after Field texted a friend to call 911 because there was a gunman in the house.

When officers arrived they found keys to the apartment outside the door. Once inside, they found the lights off and then were encountered by a man with what appeared to be a gun. Pappas said the officers fired two shots, wounding Teixeira. Police later found a bag and clothes that matched the man seen lurking around the building earlier in the day. Officers also found two fake guns and a backpack full of Bolanos’ jewelry, according to investigators.

A short time later, police went through the couple’s home and found the bodies.

“They made the grizzly discovery of two people in separate areas of the residence,” Pappas said. “Both individuals, later identified as Lina Bolanos and Richard Field, were bound, apparently at various times by various means. They had both sustained massive trauma and, after being examined by emergency medical personnel on scene, were declared deceased.”

Watch: Prosecution Presents It’s Case Against Teixeria

Family and friends of the couple were in court Monday, many of them crying as the prosecutor described the timeline of events.

The indictments read in Suffolk Superior Court charged two counts each of first-degree murder, armed robbery, and kidnapping, and one count of armed home invasion. These indictments superseded the earlier case against Teixeria in South Boston Municipal Court.

Teixeria is due back in court September 12.

WBZ NewsRadio 1030’s Kim Tunnicliffe reports