January 26, 2018 11:43 AM

The murders in the early morning hours of Feb. 9, 2014, stunned the ritzy beach community of San Juan Capistrano, California.

Andra Sachs, a real estate mogul, and her husband Brad, a former champion surfer, were shot 10 and 12 times each while in bed in their $2.5 million home. Their son Landon, 8 at the time, was left paralyzed in the rampage.

On today’s episode of People Now, shown above, PEOPLE Staff Writer Caitlin Keating explains that the couple’s 17-year-old daughter escaped the carnage and dialed 911, “saying that she woke up to gunshots.”

“It was really more than a murder,” says Keating. “It was an execution.”

The Sachs murders will be featured the upcoming episode of People Magazine Investigates, titled “Death Before Dawn,” airing Monday, Jan. 29 at 9 p.m. ET on Investigation Discovery.

The family had been touched by tragedy in the past: In 1999, 18-month-old Sabrina, the youngest of the Sachses’ four children, fell into the backyard hot tub and drowned. Her death devastated Andra — whose real estate holdings gave her a net worth of $80 million — and rocked her marriage to Brad, who at the time of his own death had recently been diagnosed with Parkinson’s disease.

• For more on how police solved the mystery of who killed Brad and Andra Sachs, watch People Magazine Investigates: Death Before Dawn, airing Monday, Jan. 29 at 9 p.m. ET on Investigation Discovery

Police were initially stumped on the murders. But about a month later, a neighbor’s surveillance camera picked up footage of a car that would eventually lead to the killer’s capture.

“After looking at more surveillance of nearby highways, they saw it was a white Prius,” says Keating.

When investigators asked other family members if they knew someone with a white Prius, family members said yes — and that it was someone very close to them.

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