Statements were being heard Monday by jurors in a Houston courtroom in the case of Ana Trujillo (troo-HEE'-yoh). She is facing a charge of murder.
Prosecutors have alleged Trujillo stabbed 59-year-old Alf Stefan Andersson after the two got into an argument at his condominium in June.
Prosecutors say Andersson, a professor and researcher at the University of Houston, became angry when a man tried to buy Trujillo a drink at a nightclub the couple had visited earlier.
Trujillo's attorney, John Carroll, has said his client has "a very valid self-defense claim."
The 45-year-old Trujillo is free on a $100,000 bond.