Authorities allege Trujillo sat on top of Andersson and struck him with the shoe during an argument at his condominium last June. Trujillo's attorney has told jurors his client was defending herself.

Also Tuesday, prosecutors played the 911 call Trujillo made in the early-morning hours and showed jurors video of the crime scene, where the shoe could be seen near Andersson's body.

On the call, Trujillo could be heard at times crying uncontrollably, telling the operator that her boyfriend had "started beating me up." She also told the operator that Andersson is "bleeding, he's about to die."

It was difficult to understand Trujillo, and the 911 operator seemed to be unsure if Trujillo was reporting an assault or that someone was injured and needed medical help.

When the operator realized someone needed medical attention, she transferred the call to emergency medical services, which directed Trujillo to perform CPR on Andersson. Trujillo said she was already doing that.

Trujillo, 45, cried as the 911 call was played.

Houston police officer Ashton Bowie testified that when he responded to the condominium, Trujillo was "covered in blood." Bowie said that he found Andersson lying on the ground, face up. His face was covered in blood and it was swollen.

"I thought his head had been blown out by a gun," he told jurors. When asked if anything could be done to save Andersson's life, Bowie said, "that moment had passed."

Bowie also said he questioned Trujillo's emotional response to the slaying.

"She was sobbing but no actual tears were coming down her face," he said.

In video taken by police at the crime scene, the stiletto heel can be seen lying on the carpeted floor of Andersson's condominium, above his head. A large pool of blood was also near his head, which was bloodied, purple and had several visible wounds.

Prosecutor John Jordan showed the shoe to jurors after the video.

The trial is expected to last at least a week. If convicted, Trujillo faces up to life in prison.