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Caption:WASHINGTON, DC - MAY 19: District of Columbia Metropolitan Police maintain a perimeter around the house on the 3200 block of Woodland Drive NW May 19, 2015 in Washington, DC. Firefighters discovered the bodies of Savvas Savopoulos, 46, his wife Amy, 47, their 10-year-old son Philip, and the housekeeper, Veralicia Figueroa, 57, last Thursday afternoon when they responded to a blaze at the house. Two Savopoulos daughters were away in boarding school at the time. Investigators have ruled the deaths homicides and say they could continue to collect evidence at the house for another week. (Photo by Chip Somodevilla/Getty Images)
Caption:WASHINGTON, DC - MAY 19: District of Columbia Metropolitan Police maintain a perimeter around the house on the 3200 block of Woodland Drive NW May 19, 2015 in Washington, DC. Firefighters discovered the bodies of Savvas Savopoulos, 46, his wife Amy, 47, their 10-year-old son Philip, and the housekeeper, Veralicia Figueroa, 57, last Thursday afternoon when they responded to a blaze at the house. Two Savopoulos daughters were away in boarding school at the time. Investigators have ruled the deaths homicides and say they could continue to collect evidence at the house for another week. (Photo by Chip Somodevilla/Getty Images)

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    Inside the D.C. mansion killings

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Inside the D.C. mansion killings

What exactly happened on the night the Savopoulos family was killed? CNN's Pamela Brown reports.

Inside the D.C. mansion killings

What exactly happened on the night the Savopoulos family was killed? CNN's Pamela Brown reports.