A landlord sentenced to decades in prison after he killed a Palestinian American boy and wounded his mother has died. Three months ago, Joseph Czuba was sentenced to 53 years behind bars for the attack.

An Illinois landlord convicted of fatally stabbing a 6-year-old Palestinian American boy and severely wounding his mother in a hate crime has died in custody, just months after he was sentenced to 53 years in prison.

Joseph Czuba, 73, died Thursday while in the custody of the Illinois Department of Corrections, said Kevin Hedemark, sheriff’s office spokesperson.