Geoffrey Greer, 24, was shot and killed during an early-morning dispute on the roof of an apartment building on Pacific Avenue in San Francisco’s Nob Hill neighborhood. The shooting occurred about 2:30 a.m. on April 13, 2013. Greer, a Monte Vista High School and Cal Poly San Luis Obispo graduate, worked as a Senior Media Planner for MEC in San Francisco and was remembered by family and friends for his intelligence and hard work.

Sixty-six-year-old Robert Graves was arrested and charged with murder and a special allegation for the personal use of a firearm; bail was set at $3 million. Graves pleaded not guilty and a status hearing was scheduled for May 1, 2013. Family and friends attended court but did not speak to the media.

What additional details about the roof party or the dispute would help explain how the shooting began?