The jury got the case a little after 11:30 a.m. Tuesday.
They did ask one question about instructions about 5 p.m. before, around 6 p.m., pausing deliberations, to resume at 9 a.m. Wednesday.
In court, the judge gave instructions to the jury, which gives them the option of finding Grayson guilty of first- or second-degree murder, or not guilty of either.
Closing arguments also took place Tuesday morning.
Sangamon County State's Attorney John Milhiser said during his closing argument, "These are the actions of a bully. The defendant is guilty of first-degree murder."
The former officer's defense attorney Dan Fultz, however, says Grayson feared for his life, telling the court, "What happened to Sonya Massey was a tragedy, not a crime."
Police seem to be prepared for the worst.
Numerous officers surrounded the Peoria County Courthouse, with streets closed and fencing up.
The protestors, about three dozen or so, were chanting and getting the attention of passersby. They are calling for justice for Sonya Massey.
They want Grayson to be convicted.
Grayson took the stand Monday.
He was questioned about his version of events the night he shot and killed Massey inside her Springfield-area home.
Grayson told the court he fired when Massey raised her hands, he says, to throw a pot of hot water at him.
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The moment he described is not captured on body camera footage.
He had originally responded last July to a call of a reported prowler.
Massey's family has been in the courtroom the whole time, leaving during recess Tuesday, while they wait for the verdict.
Many of those in the courtroom have traveled from near Springfield.
Attorneys succeeded in getting a change of venue to try the case in Peoria due to media attention.
Grayson, 31, who was fired from the sheriff's office, has pleaded not guilty. If convicted of murder, he faces 45 years to life in prison. Prosecutors dismissed single counts of aggravated battery with a firearm and official misconduct.
Massey's family has already settled a civil suit out of court for $10 million. The family, as well as attorneys from that case, plan to speak after the verdict is announced.