The Houston woman facing murder charges for fatally stabbing her boyfriend with a stiletto heel claimed she was acting in self-defense, according to Houston police.

Ana Lilia Trujillo, 44, admitted to killing her boyfriend and stabbing him 10 times with her high-heeled shoe but told investigators she only did so because he grabbed her and a struggle ensued.

Her 59-year-old boyfriend was identified as Alf Stefan Andersson, a research professor who worked at the University of Houston Center for Nuclear Receptors and Cell Signaling.

Trujillo made her first court appearance since the incident in a Harris County court Monday night, a day after the killing. She appeared in court wearing flip flops.

Police said they found Andersson in his apartment lying on the ground, face-up, with a stiletto heel near his head. He was stabbed 10 times in the head with the heel – some wounds almost 2 inches deep – and had 15-20 puncture wounds on his face, arms and neck, police said. He was pronounced dead on the scene.

 “On arrival, [an] officer rang the doorbell, and the defendant Ana Trujillo answered the door with blood on her clothes and on her hands,” the prosecutor said during court.

Jim Carroll, who used to manage the Londale Hotel where Trujillo lived before moving in with Andersson, said that he was not surprised after hearing about his former resident’s situation.

“Before the name was released – I saw a woman killed a guy with a stiletto, I remember seeing something on the news about it – I said, “Oh, that sounds like Ana,” Carroll told the local ABC station.

“Twice she told me that if anybody ever messed with her, she pulled her shoe off and said, ‘I’ll get them with this.’ And it was a big stiletto heel,” Carroll said. “She’s a strong woman.”

The couple lived at The Parklane, a luxury Houston high-rise condominium.

"The University of Houston community is saddened to learn of the tragic death of Professor Stefan Andersson. Our hearts go out to his colleagues, family and friends during this difficult time," the university said in a recent statement.

Trujillo, a Mexican national and former massage therapist, said that she and Andersson had recently moved in together. As of Monday night, she asked for a court-appointed attorney and remained in jail at a $100,000 bond.

Follow us on twitter.com/foxnewslatino
Like us at facebook.com/foxnewslatino