Payton Gendron is expected to plead guilty to state charges.
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Gendron's hearing was supposed to take place last week but was delayed due to the historic snowstorm in the region.
Attorneys representing the families of the victims have been told to expect a guilty plea.
ALSO READ | Buffalo supermarket mass shooting: What we know about the alleged gunman
Buffalo shooter may have planned attack months beforehand: Authorities
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The 19-year-old is accused of shooting and killing 10 people inside the Tops supermarket back in May.
READ MORE: Suspect asked to leave Buffalo supermarket day before shooting
Buffalo shooting suspect accused of traveling more than 200 miles to carry out attack
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