ST. LOUIS ( KMOV /Gray News) - A 2-year-old boy was sexually assaulted and killed by his babysitter while his mother was at work, according to authorities in St. Louis.

Bianca Wells said her son Bre’Yon was “so happy.”

“My baby was so happy. He was so loving. He loved everybody and everything,” she said. “He just wanted to be a kid and enjoy life. I thought that’s what he was doing.”

According to the St. Louis Metro Police Department, Bre’Yon was left in the care of 21-year-old Nicco Cotton on Oct. 27. Cotton was a close friend and Wells’ boyfriend.

Cotton admitted to sexually assaulting and strangling Bre’Yon after turning himself in on Thursday, according to court documents.

Prosecutors charged Cotton with second-degree murder, forcible sodomy, statutory sodomy and abuse of a chil

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