Iolanthe is correct.
here you go.
http://www.imdb.com/character/ch0011637/
Lt. Columbo (Character)
from Columbo: Murder by the Book (1971) (TV)
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Overview
Biography:Warning! This character biography may contain plot spoilers.
His Christian name is Frank (unconfirmed), and has lots of brothers... more
Alternate Names:Columbo / Lieutenant Columbo / Lt Columbo
Dave.