A Houston woman is currently on trial for killing her professor boyfriend after she allegedly beat him to death with her stiletto heel. Opening arguments began on Monday in Texas.

Ana Trujillo, 45, is accused of taking her pointy, high-heeled shoe, or stiletto heel, and stabbing University of Houston professor Stefan Andersson multiples times in the head in June 2013, Reuters reported.

Prosecutors say that Trujillo was able to carry out her assault by sitting on Andersson, 59.  The victim suffered nearly 24 stab wounds, most to his face and neck, during the attack that occurred in his Houston apartment, Reuters reported.

The couple allegedly got into a fight that June night because another man tried to buy Trujillo a drink at a bar before going back to Andersson's apartment, ABC News reported.  

Defense attorneys for Trujillo claim she beat her boyfriend out of self-defense and that she had been angry at him in the past, ABC News reported.

"Stefan Andersson grabbed her, they started wrestling, he got on top of her and she couldn't breathe," defense attorney Jack Carroll said before the trial, ABC News reported "He got her in a hold."

But prosecutors argue that Trujillo tried to cut off Andersson's blood supply by "applying pressure to [his] neck," according to court records obtained by ABC News.

Experts say the fact that the alleged murder weapon is a stiletto heel, and not a more common one, could work in Trujillo's favor.

"A stiletto heel is not what's typically used to kill someone," ABC News Chief Legal Affairs Anchor Dan Abrams said. " It's not a knife or a gun, it's more of a self-defense tool, something you use because that's all you have. The fact that the weapon was a stiletto heel tends to help the defense."

Trujillo faces a sentence of five years to life if she is convicted, ABC News reported.