Derek Venturi was played by Michael Seater on Life with Derek, the Canadian sitcom which premiered in 2005 and ended in 2009.
Michael Seater as Derek Venturi, the oldest clueless child and the titular "Derek" of the series. Unlike Casey, he is lax-mannered and somewhat underhanded about achieving his goals and excelling in his academics, though is not entirely unkind. Derek is a straight-D student. It is shown that he has a bond with Marti because he calls her "Smarti" and she calls him "Smerek". However, he enjoys annoying and pulling pranks on Casey. Derek has his own band called D-Rock in which he plays guitar. In the final season, he receives admission to Queen's University along with Casey. Life with Derek is a Canadian television sitcom that aired on Family Channel (English) and VRAK.TV (French) in Canada and on Disney Channel in the United States. The series premiered on Family on September 18, 2005, and ran for four seasons, ending its run on March 25, 2009. 
