A prominent Silicon Valley tech executive has been arrested for murder. He is accused of the April 4 death of Bob Lee, the founder of Cash App. Lee also invested in other science and tech companies, including SpaceX.

The April 14 arrest warrant identified the suspect as Nima Momeni. According to the report, Lee had been drinking with a group of friends on the night before the murder. Momeni's sister, Khazar Momeni was present. 

Nima argued with Lee about his sister before the fatal stabbing. 

The incident has shed a spotlight on San Francisco's crime problem, with notable tech personalities, including Twitter CEO Elon Musk, speaking out about the city's alarming rates of violent crime.

Prior to the arrest, many believed Lee was killed due to an attempted robbery or perhaps murdered by a homeless person.

Suspect identified as a Silicon Valley tech executive

According to court documents released on Friday, text messages and other evidence provide insight into the events leading up to Lee's murder. 

Police are now claiming it was a planned attack.

Texts between Momeni’s sister and Lee are a part of the court documents.

Several of Lee’s friends have given statements. One friend who spoke to police said that Lee told Momeni that his sister had not taken any substances and that "nothing inappropriate had happened."

The video shows the pair driving together in the early hours through downtown San Francisco. Their argument continued even after Lee exited the car that was registered to the suspect. 

Momeni is suspected of stabbing Lee multiple times. And the knife was recovered near the scene on Main Street.

Police claim that Momeni brought a large kitchen knife with him in a “planned and deliberate attack.”

"This scenario would explain in part why Lee was walking through a portion of Main Street in which there is little to no foot traffic at 2:30 a.m.," according to news outlet Mission Local. 

"That was one of several incongruous circumstances surrounding Lee’s violent death, which law-enforcement sources from the get-go felt made it far from a straightforward or random crime."

On Friday morning, San Francisco police executed a search warrant on Momeni's sister's apartment. 

Momeni remains in custody without bond.

San Francisco crime wave

There has been increased violence and murders in San Francisco. And Lee's death has received significantly more attention in the news and on social media than most crimes.

Residents of the city have been shocked by the ever-increasing rate of homelessness in the area. With drug paraphernalia and waste littering the streets businesses are closing their doors. And locals are alarmed at the increase in violent crimes. 

Recently large groups of young people were seen in a violent brawl at Stonestown. The violent crime wave also resulted in the abrupt closure of a Whole Foods store in mid-market. And that leaves only eight others within the San Francisco city limits.

 Mayor London Breed said that the press reports are lumping Lee’s stabbing with other incidents of violence seen under her administration. 

'When the facts of many of these cases come out, many people are going to be surprised,' she added.