SAN FRANCISCO (KRON) -- On Tuesday, a San Francisco jury found Nima Momeni guilty of second-degree murder in the killing of Cash App found Bob Lee. Prosecutors had sought a first-degree murder conviction, arguing that a vengeful Momeni stabbed Lee out of concern for his sister, Khazar. Lee, according to court testimony, introduced Khazar to his drug dealer, who then allegedly sexually assaulted her. Momeni also suspected Lee had an inappropriate relationship with Khazar. Who is Khazar Momeni? Sister of Bob Lee killer was key figure in trial The defense argued Momeni stabbed Lee in self-defense after the tech mogul became enraged over a "bad joke" and had sought a lesser charge, arguing Momeni stabbed Lee in self-defense. In the end, the jury chose second degree murder, which according to San Francisco District Attorney Brooke Jenkins, sees Momeni facing 16 years to life in prison. California penal code describes murder as "the unlawful killing of a human being, or a fetus, with malice afterthought." First degree murder, according to code, includes "willful, deliberate, and premeditated killing," or killing that is "committed in the perpetration of, or attempt to perpetrate, arson, rape, carjacking, robbery, burglary, mayhem, kidnapping, train wrecking, or any other act punishable under" various sections of the state penal code. "All other kinds of murders are of the second degree," according to the penal code. In the case of Momeni, a charge of second-degree murder was reached because the jury felt it was intentional, but not a premeditated act. Typically, a second-degree murder conviction in California carries a penalty of 15 years to life. In Momeni's case, he is facing an extra year because the allegation of the personal use of a deadly weapon -- a knife -- was found true by the jury.