Bonanza 33
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Other ATP
Flight Crew Last 90 Days 30; Flight Crew Total 24000; Flight Crew Type 500
Conflict NMAC
Flight Crew Took Evasive Action
Airspace Structure; Human Factors
In descent while returning to land at ZZZ from west of the airport and north of the Denver Class B airspace; I received a TCAS warning very close to our aircraft. I made a rapid and aggressive descending turn away from the threat aircraft in the direction of the Class B airspace (the only way that I could turn). We were near; but below the ceiling of the Class B segment and did not enter it. We never did see the other aircraft. The remainder of approach and landing were normal.
GA pilot reported taking evasive action in response to a TCAS warning near DEN Class B airspace.