Virginia college student Luisa Cutting charged with murder of best friend Alexa Cannon

A college student has broken down in tears in her mugshot after she was arrested on suspicion of stabbing her best friend 30 to 40 times in the apartment where they both lived.

Luisa Ines Tudela Harris Cutting, 21, was charged with second-degree murder on Thursday in western Virginia in the death of her Radford University classmate Alexa Cannon, 20.

Police were called to the students' apartment complex at 7.45am on Thursday, with the dispatcher reporting that a female caller was screaming something about a knife.

When they arrived, officers were greeted by Cutting, who was covered and blood, and turned around placing her hands behind her back saying 'arrest me', according to an arrest warrant.

When asked why they should arrest her, the warrant states that Cutting replied: 'I killed her.'

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