Bob Lee, the 43-year-old former chief technology officer of Square who helped launch Cash App, has died after an apparent stabbing attack. Video footage shows that he walked up an empty San Francisco street in the early hours of Tuesday, gripping his side with one hand and his cell phone in the other, leaving a trail of blood behind him. "Help!" he screamed into his phone. "Someone stabbed me." It was too late. He later died in the hospital!