Bernhardt ''Bernie'' Tiede II (/tid/; born August 2, 1958) is an American mortician and convicted murderer. Tiede confessed to the shooting of a wealthy 81-year-old widow, Marjorie ''Marge'' Nugent, in Carthage, Texas on November 19, 1996. The murder is the subject of the 2011 film Bernie, directed by Richard Linklater and starring Jack Black as Tiede.

Can we conclude that is movie bernie based on a true story?
yes