<Tr> <Th_colspan="2"> Derek Shepherd </Th> </Tr> <Tr> <Td_colspan="2"> Grey's Anatomy character </Td> </Tr> <Tr> <Td_colspan="2"> Patrick Dempsey as Derek Shepherd in 2012 </Td> </Tr> <Tr> <Th> First appearance </Th> <Td> "A Hard Day's Night" (1.01) March 27, 2005 </Td> </Tr>

When does derek leave his wife for meredith