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"MYSTERY IN THE MANSION" ON "20/20"

Airs Friday, June 12, 10 PM ET on ABC

On May 14, 2015, three members of a wealthy Washington, DC area family and their housekeeper were murdered in their own home. The victims were held hostage for 19 hours, starting on May 13. Even their 10-year-old son was murdered for $40,000 in cash. To date, only one suspect is in custody - the result of a 48-hour manhunt that spanned from Washington, DC to New York and back again. "20/20" provides the very first in-depth look at the grisly crime that has captivated the country. Exclusive interviews include the surviving housekeeper who knew the family well, and a victim from the prime suspect's past. And we use floorplans to take you inside the stately brick mansion for the first time. Ryan Smith's report airs on "20/20" on FRIDAY, JUNE 12 (10:00-11:00 p.m., ET) on the ABC Television Network.

"20/20" is anchored by Elizabeth Vargas and David Muir. David Sloan is senior executive producer.