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A St. Louis man convicted of brutally beating to death his 2-year-old son will spend the rest of his life behind bars. 

The reasons may be unknown--an alcohol fueled rage or bipolar disorder--but a jury has made sure 32 Aaron Lucy of south city  will never hurt another child. 

He was found guilty of first-degree murder and four felony counts of child abuse, evidence tampering and armed criminal action in the death of his son, Kyle Lucy. He has no chance for parole.

The boy's mother,30-year-old Amanda Newman, told the St Louis Post Dispatch she was satisfied with the life sentence because she believes it will keep Lucy away from their daughter, Abby, who is now 7. 

Prosecutors said Lucy beat Kyle to death the day after Christmas 2010 while the family was at a holiday play. 

Authorities said Lacy left bruises and scrapes on almost every part of the toddler's body and caused two skull fractures and a fatal brain injury. Blood was found throughout the apartment, including on the back of a picture frame, a broken drawer an overturned television that had been thrown across the floor. 

Lucy's mother argued he should be in a mental hospital rather than prison.