In the video, Mr Grayson sees a pot sitting on a stove, gestures towards it and says, “we don’t need a fire while we’re here”.
Ms Massey walks to the stove to remove the pot. She and Mr Grayson appear to laugh over her pot of “steaming hot water,” before she twice says: “I rebuke you in the name of Jesus.”
“You better [expletive] not or I swear to God I’ll [expletive] shoot you in your [expletive] face,” Mr Grayson says. He then draws his pistol as he shouts for her to drop the pot.
“OK, I’m sorry,” Ms Massey is heard saying before she ducks.
After shooting her, the officer says: “What else do we do? I’m not taking hot [expletive] boiling water to the [expletive] face.”
On Monday, the Sangamon County State’s Attorney’s Office said Mr Grayson was not justified in his use of force on Ms Massey.
In a statement, President Biden said he was “heartbroken” for her family.
“Sonya Massey, a beloved mother, friend, daughter, and young Black woman, should be alive today,” he said.
“Sonya’s death at the hands of a responding officer reminds us that all too often Black Americans face fears for their safety in ways many of the rest of us do not.”
Illinois Attorney General Kwame Raoul called the footage of the shooting “horrific” in a statement on Monday.
“As the community reacts to the release of the footage, I urge calm as this matter works its way through the criminal justice system,” Mr Raoul said.
Lawyers for Ms Massey’s family have commended prosecutors for their swift action against Mr Grayson.
Lawyer Benjamin Crump said the footage “is going to shock the conscience of America”.
“It is that senseless, that unnecessary, that unjustifiable, that unconstitutional,” he said.
