Cash App founder Bob Lee is seen in video staggering and collapsing after being stabbed

He tries to flag down a passing car to no avail, before frantically dialing on his phone. The brutal killing has ignited concern over public safety in San Francisco Lee appears disoriented as he approaches an apartment building at 2:34am Tuesday, clutching his side with one hand, and holding his phone with another Harrowing CCTV footage obtained by DailyMail.com shows Bob Lee staggering and then collapsing on the street after being stabbed in San Francisco The final moments of Cash App founder Bob Lee can be seen on CCTV footage as he clutches his wounds and begs passersby for help after his savage stabbing in lawless San Francisco – only to be left to die. Harrowing footage obtained by DailyMail.com shows wounded Bob Lee staggering towards an apartment building with blood on his hands after being stabbed in San Francisco early Tuesday The 43-year-old appears disoriented and collapses in front of The Portside apartment complex on 403 Main Street in Rincon Hill At one point, Lee attempts to get a passing car's attention by desperately waving his hand to no avail At the intersection with Harrison Street, a short walk from the iconic Embarcadero waterfront, he steps in front of a car and appears to lean over the hood pleading for assistance. The second camera pointing back through the front doors, confirms that – tragically – nobody was inside the lobby either Tech executive and investor Bob Lee helped create Android and Cash App General views of the Portside apartment building following Lee's tragic death Mourners have since laid flowers and sympathy messages by a tree outside the building So far this year there have been 39 murders in the city. Bob Lee, pictured with his wife Krista and two daughters, had decided to stay an extra day in San Francisco on a business trip Officers raced to the scene and rendered first aid but by then it was too late to save Lee Twitter and Tesla CEO Elon Musk also commented on the horrific incident, asking the San Francisco DA what she is doing to 'incarcerate repeated violent offenders' 'He was really respected in the tech community, never talked about his accomplishments, other people would tell me, 'Oh yeah, Bob's a super big deal in the tech industry.''