Kansas City Chief's linebacker Jovan Belcher shot and killed his girlfriend before shooting himself because she told him he was not the father of their baby daughter.

Belcher's mom said the couple argued over the paternity of their 3-month-old daughter right before the murder suicide at her son's home in Missouri.

Sources say his mom believed that there was an issue over whether [Belcher] was the father and that he believed he wasn't necessarily the father.

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