CHI84FA049

At 2135 EST, the plt called the lansing fss & requested a wx forcast for the detroit city arpt & winds aloft. He was briefed, but he did not file a flt plan, sometime after 2200 EST, he took off form mason, MI on a passenger flt to ann arbor, MI. At 2252, the plt called the lansing fss & obtained the current lansing wx. After landing at ann arbor, two additional night, passenger flts were made (to the detroit city arpt & back to ann arbor). After the 2nd landing at annn arbor (aprx 0200), the plt went to a restaurant 'for something to eat.' At aprx 0400, he took off alone on a flt back to mason. At about 0426, the acft crashed aprx 11.5 mi nw of the departure arpt. The acft impacted on a westerly heading in an estimated 58 deg descent. A witness about 3/4 mi nnw of the crash site said the acft sounded like it was on a se heading when it passed over her home. An exam of the wreckage revealed no evidence of a preimpact malfunction or failure. Unfav wx, low ceiling, rain & fog was forming. At 0530, hvy fog at Dexter. No current med cert.