Several times during testimony on Thursday, Momeni sparred with Prosecutor Talai, at times asking him questions or saying things such as, I'm sorry if my answer doesn't satisfy your expectations.

Nima Momeni, the man accused in the fatal stabbing of tech executive Bob Lee, testified that Lee attacked him after getting angry about "a bad joke" at his murder trial Wednesday.

For the first time since Nima Momeni was charged with murdering tech mogul Bob Lee, the accused killer told his side of the story. Momeni broke his silence in front of San Francisco jurors who will decide his guilt or innocence.

Nima Momeni, the man accused in the fatal stabbing of tech executive Bob Lee, testified for the first time in his defense at his murder trial Wednesday morning.

Momeni’s defense called witnesses to bolster their argument that Lee may have acted aggressively. One witness said that was one possibility.

The tension was high and growing higher Thursday in a San Francisco courtroom as the prosecution cross-examined murder defendant Nima Momeni about Cash App founder Bob Lee's stabbing death.

Defense attorneys for Nima Momeni — the man accused of fatally stabbing tech executive Bob Lee – called a medical expert to the witness stand Tuesday who testified that it is possible that their theory of self-defense could be true.