The 42-year-old Noll was gunned down in his own car on Aug. 31 while waiting at a red light on 15th Avenue NE at NE 75th Street.
According to police, the shooter pulled up in the oncoming traffic lanes next to Noll and for reasons that may be related to road rage, fired multiple rounds at Noll, striking him several times. The suspect then fled the scene in his car and remains at large.
The suspect's vehicle is described as a silver 2002-2008 BMW Z4 convertible with a black interior. The car may have recent body damage, including a broken-out passenger side window.
Several witnesses describe the shooter as a well-dressed white or Asian male in his late 20s to 30s with dark, slicked-back hair and were able to provide investigators with enough details to generate a sketch.
Noll was a wine steward for the QFC grocery chain and was well-known in the wine community. Friends describe Noll as a good-hearted outdoorsman who had been planning a kayaking trip in the coming days. They can't imagine any motive for killing him.
"He had a heart of gold. He really cared about people," said friend, Laural Waters. "It just feels senseless, given who he was."
Anyone with any information is asked to call 911 or the Seattle Police Homicide Tip Line at (206) 233-5000. Anonymous tips are welcome.