(Portland, OR)  --  Police are investigating a crash that killed a pedestrian on I-205 in Portland.  All southbound lanes on the highway were closed yesterday after a man was killed near the Killingswoth Street off-ramp.  Authorities say the man died after being hit in the southbound lanes, possibly after panhandling in the northbound lanes.  All lanes of I-205 were reopened by around 8:40 p.m.