During today's opening arguments in the highly anticipated murder trial of Nima Momeni, who is accused of stabbing CashApp founder Bob Lee to death last year, lawyers presented two different versions of events: one in which Momeni was a hostile aggressor, the other, in the Lee was a drug-addicted and sleep-deprived attacker.

“Pierced his heart – and left to die,” Omid Talai, the lead prosecutor, said slowly and deliberately to the packed San Francisco Superior Court courtroom, punctuating his version of events with images projected on two large screens of Lee lifeless and stitched together Lives showed bodies.

He also showed the jury of seven men and five women surveillance footage of Lee's movements in the hours before his death.

Saam Zangeneh, Momeni’s main defender, began with a similarly dramatic opening: “Six. Six hours,” he said. Evidence would show, he said, that Lee slept only six hours in the 91 hours before his death. And during his waking hours, Zangeneh claimed, Lee used cocaine and other drugs.

Prosecutors have presented a case, reiterated by Talai today, that Momeni was upset by what was perceived as an inappropriate interaction between his sister Khazar Momeni and Lee. Defense attorneys, meanwhile, claimed that Lee was the actual attacker and that Momeni “stood his ground” and turned Lee's own knife on him.

The jury listened carefully to Talai's nearly hour-long opening statement and then heard another half hour from Zangeneh before prosecutors began calling witnesses to the stand. Momeni, dressed in a dark blue suit, sat among his five-member legal team and took notes in a notebook with a pencil.

Talai argued today that this DNA evidence could undermine the defense's argument. No DNA from Lee was found on the handle of the “Joseph Joseph” brand knife found near where Lee died. The knife is said to match those found in Khazar Momeni's house.

Prosecutors have previously alleged that Lee's DNA was found on the blade of the knife and Momeni's DNA was found on the handle.

“None of Bob’s DNA was on the handle. Because he didn’t hold the knife, he was stabbed,” Talai said.