Cash App founder Bob Lee had drugs and alcohol in his system when he was stabbed to death last month, according to a toxicology report from the local medical examiner.

Lee, 43, was stabbed to death in San Francisco in the early hours of April 4. He was stabbed twice in the chest and once in the hip. He died during emergency surgery at Zuckerberg San Francisco General Hospital after doctors worked for about four hours to treat him but were unable to close his wounds.

Nima Momeni, a 38-year-old tech consultant, was charged with the murder more than a week later after days of unfounded speculation that the crime was a robbery or random attack by a repeat offender.

The autopsy report from the San Francisco Medical Examiner’s Office said Lee was stabbed in the heart and lung. A toxicology report found that he also had alcohol, cocaine and ketamine in his system when he died, but did not link the substances in Lee’s system to his death.

According to the reports, which were obtained by CBS News Bay Area, Lee was unconscious, pulseless and having trouble breathing when paramedics intubated him and took him to the hospital.

Lee and Momeni knew each other and had argued about the suspect’s sister before the stabbing, prosecutors said. A witness told police that Momeni had asked Lee earlier “whether his sister was doing drugs or anything inappropriate.” Momeni allegedly later drove with Lee to a secluded spot before stabbing him.

Investigators said Momeni’s sister texted Lee about the men’s argument. “Just wanted to make sure you’re doing ok cause know nima came wayyyyyy down hard on you,” she wrote.

The nature of the relationship between Lee and Momeni’s sister has not been disclosed.

Momeni is being held without bail. He was scheduled to appear in San Francisco County Superior Court on Tuesday, May 2, but his arraignment was rescheduled for May 18.