A McKinney couple is in jail and a 3-year-old boy is in critical condition after his mother left him with her boyfriend while she was at work.

Police said officers responded to Medical City McKinney hospital on Oct. 14 regarding a 3-year-old brought to the emergency room by his mother's boyfriend, Christopher Alexander.

Medical staff said the child had serious injuries and was unresponsive when he arrived at the hospital.

According to an arrest affidavit, Alexander said he found the boy after hearing a thud from another room. The boy had severe brain trauma, bleeding in the brain, bruising all over his body as well as wounds on his chest, stomach and rear.

Hospital staff told police that the boy's injuries did not match up with Alexander's explanation.

The boy's mother, Chelsea Berg,

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