...Wisconsin's online courts database shows that Robinson, a 2014 graduate of Sun Prairie High School, pleaded guilty to felony armed robbery in October and was sentenced in December to three years' probation. A police report said he was among four teenagers arrested in a home invasion in which the suspects were seen entering an apartment building with a long gun. They ran with electronics and other property and three of the four were captured. A shotgun and a "facsimile" handgun were recovered, according to the report.
Koval declined to discuss Robinson's background Saturday, saying he thought it was inappropriate.