Withers mother arrived home on the 6400 block of Brooke Jane Drive around 7:35 a.m. Friday and found the girls suffering from stab wounds, the statement said.
Antonio Williams, from Maryland in the U.S., was left to look after the three girls, all aged under 10.
Sovereign George's County police in rural Washington said Antonio Williams, 25, of Clinton, admitted to the homicides, Fox 5 DC announced Saturday. Investigators are working on determining why this gruesome incident happened.
Prince George's County Deputy Chief Sammy Patel called the slayings "one of the most hard scenes" that the department's officers have encountered, and said the department will provide counseling services to responding officers, according to the Associated Press.
According to the arrest warrant, Williams was taking care of all three children overnight on Thursday and into Friday.
The Decree sisters were visiting from Newark, N.J., for the summer.
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Lisa was transported to a nearby hospital for treatment but was later released to her family's home in Louisville , Alabama . An Alabama woman missing for almost a month was found safe after surviving in the woods on berries and mushrooms, she said .
Emergency services were called and the three girls were pronounced dead at the scene.
In a news conference police described the scene inside the home as so "gruesome" that responding officers were given counselling support at the scene. "We have not determined who the person responsible is yet", she added.
Williams has been charged with first and second degree murder. They said he did not provide a reason for the attack.
"This is one of the most hard scenes that our officers arrived on". Meanwhile, the officers who discovered the scene are being offered counseling.
State's Attorney Angela Alsobrooks, said: 'We are absolutely heartbroken and we are so absolutely devastated'.