After she allegedly killed the children, she video chatted her boys' father, Jameel Penn. He alerted the police immediately when he saw his motionless children on the ground and realized something wasn't right.
Jakarter Penn, 1, and 2-year-old Keyounte Penn, were found dead with injuries that included burn marks on their bodies, possibly from the stove, police said.
Police removed the stove and oven from the apartment.
A 3-year-old was found alive in the house.
Williams reportedly told police she had left the children with her sister and returned home to find the two infants unresponsive.
However, investigators told WXIA they did not believe her account of the events.
Neighbours have held a vigil over the weekend to honour the two boys.
Police are still investigating.
- Additional reporting by the Daily Mail