UPDATE: Inventor and retired MU professor Henry Liu died in crash Tuesday

Wednesday, December 2, 2009 | 3:07 p.m. CST; updated 9:16 a.m. CST, Thursday, December 3, 2009

COLUMBIA — The man killed in a single-vehicle crash on Interstate 70 Tuesday was a Columbia engineer and a retired MU professor known for his work in "green" technologies.