The angle of the shot may be what makes it look so short, but still, the engine nacelles could be for piston or turbine - look at the pressurized Navajo - http://www.airport-data.com/aircraft/photo/162665.html
The original Cheyenne, which became I and II, looks just like the pressurized Navajo except it has turbo-props. Kind of hard to tell here which it is, but I will go with the Piper product of the PA-31 series.