Williams has been charged with three counts of first and second-degree murder and other related charges.
A neighbor has been arrested in connection with the gruesome murder of three young girls under the age of 10 who were found dead inside a Maryland home. A fourth child, a 2-year-old, was inside, alive and unharmed, according to a law enforcement official familiar with the case.
Police department spokeswoman Jennifer Donelan said: "We are now in the midst of a major investigation into what happened to these children and who killed them". Police did not release a motive for the killing on Saturday morning.
Investigators said his mother, Andrena Kelley, left Williams alone to watch over the children while she worked an overnight shift.
Capt. Anthony Schartner discussed what police know so far from their investigation into the triple homicide in Prince George's County.
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Police said they were called to the house shortly after 7:35 a.m. The victims were suffering from stab wounds and all pronounced dead on the scene.
Starting at a Friday evening public interview, police still weren't discharging the names of the kids, or how they were connected. Police say Williams resided on the same street as the home where the three girls' bodies were found.
"We believe we have made contact with a parent", Deputy Chief Sammy Patel said.
That work is being done in concert with the office of State's Attorney Angela Alsobrooks, who took the opportunity to speak on behalf of county residents, saying, "We are absolutely heartbroken and we are so absolutely devastated".
Velez said that he wants to "assure the community" that the police department will work "tirelessly" to find those responsible for their deaths.