2008 | 2008 Summer Olympics | 2008 in music | United States presidential election, 2008 | Arena Football League (1987–2008) | 2010 NFL Draft | UEFA Euro 2008 | Eurovision Song Contest 2008 | 2008 Sichuan earthquake | Barack Obama presidential campaign, 2008 | 2008 World Series of Poker | John McCain presidential campaign, 2008 | Canadian federal election, 2008 | 2008 Commonwealth Youth Games | 2008 Rugby League World Cup | 2008 Summer Paralympics | 2008 in film | Athletics at the 2008 Summer Olympics – Men's 4 × 400 metres relay | 2008 ATP Tour | UEFA Euro 2008 qualifying Group G | Oregon legislative elections, 2008 | Nepalese Constituent Assembly election, 2008 | Malaysian general election, 2008 | Alberta general election, 2008 | 2008 Mumbai attacks | United States Senate election in Minnesota, 2008 | The Doctors (2008 TV series) | Quebec general election, 2008 | NBA draft | Italian general election, 2008 |
On March 5, 2008, he was traded to the Saskatchewan Roughriders, along with Ronald Flemons, Toronto's first round selection in the 2008 CFL Draft, and Toronto's second round selection in the 2010 CFL Draft in exchange for Kerry Joseph and Saskatchewan's third round pick in the 2010 Canadian Draft.
Knowlton was traded on April 29, 2008 from BC Lions to the Hamilton Tiger-Cats along with kicker Ara Tchobanian in exchange for the 9th overall selection in the 2008 CFL Draft.
He was traded to the Saskatchewan Roughriders on March 5, 2008, along with Glenn January, Toronto's first round selection in the 2008 CFL Draft and Toronto's second round selection in the 2010 CFL Draft in exchange for Kerry Joseph and Saskatchewan's third round pick in the 2010 Canadian Draft.