<Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 21 </Td> <Td_colspan="1"> January 17, 2003 (2003 - 01 - 17) </Td> <Td> March 5, 2004 (2004 - 03 - 05) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> October 3, 2003 (2003 - 10 - 03) </Td> <Td> September 24, 2004 (2004 - 09 - 24) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 35 </Td> <Td_colspan="1"> October 1, 2004 (2004 - 10 - 01) </Td> <Td> January 16, 2006 (2006 - 01 - 16) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> February 20, 2006 (2006 - 02 - 20) </Td> <Td> November 10, 2007 (2007 - 11 - 10) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 21 </Td> <Td_colspan="1"> January 17, 2003 (2003 - 01 - 17) </Td> <Td> March 5, 2004 (2004 - 03 - 05) </Td> </Tr>

Why did the mother of that's so raven leave the show