A US university footballer tweeted his love for his cheerleader girlfriend hours before he was charged with her murder.

WBIR reports that Emma Jane Walker, 16, was found dead from a gunshot wound in her home on Monday morning.

Overnight, her boyfriend, William Riley Gaul, 18, was charged with her murder.

Gaul, who previously attended Central High School in Tennessee like Walker, allegedly fired a gun into her home "with exact proximity to where the victim, Emma Walker was sleeping", according to the arrest warrant.

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The couple had recently ended their relationship but Gaul refused to accept the breakup, according to Walker's aunt Jenny Weldon.

William Riley Gaul and Emma Jane Walker went to prom together. Photo / Twitter
William Riley Gaul and Emma Jane Walker went to prom together. Photo / Twitter