Accused killer of tech exec Bob Lee pleads not guilty and denied bail.

Nima Momeni, the man accused of fatally stabbing tech executive Bob Lee, has pleaded not guilty to murder in a San Francisco court. Lee was stabbed to death in the Rincon Hill neighborhood in the predawn hours of April 4. Authorities have said Lee and Momeni knew each other and were in a white BMW shortly before the stabbing at about 2 a.m. The prosecution’s case relies heavily on grainy security video of what they say was the fatal stabbing, and the district attorney’s office has indicated the stabbing may have been premeditated.