Two brothers convicted of killing a Waterloo woman last year are going to prison for the rest of their lives. Racardious and Christopher Spates of Waterloo received the mandatory sentence for first-degree murder in Black Hawk County District Court yesterday. Last month, a jury found the brothers guilty for their role in the fatal shooting of Thyanna at an after-hours party. The shooting occurred last October. Three sets of Waterloo brothers were charged with murder in the crime. Damean Spates and Dorondis Cooper have pleaded guilty to lesser charges. Their sentencing was also scheduled for yesterday, but was postponed. The murder trial for the other brothers — Joseph and Shawn Washington — is scheduled to begin on Tuesday.