Stephen Coffeen says Red Bull, in part, made him do it.

The Pinellas County, Florida man said through his attorney that a lethal combo of the energy drink and lack of sleep put him into a frenzied state that led him to smother his 83-year-old father to death with a pillow in December 2009.

Coffeen's lawyer George Tragos is arguing that because of such circumstances, his client be found not guilty by reason of insanity in his ongoing trial.