The tour started poorly for Walker, only making one score of note in the series although he managed to average 48.00 in the limited-overs games that followed.

[4] Against a Somerset attack without Andy Caddick, Walker compiled 275 not out in nine-and-a-half hours before his captain Trevor Ward declared the innings at 616/7.

The Daily Telegraph's Christopher Martin-Jenkins wrote of the innings: "It was an innings of style and substance, memorable for powerful driving through the off-side and hearty pulling whenever a persevering but ordinary Somerset attack became impatient with line and length and tried to extract a spring in the pitch which simply was not there.

Walker was appointed List A captain of Kent for the second half of the 2005 season, following the resignation of David Fulton.

[10] However, after finding first-team opportunities limited during 2008, he was released by Kent[11][12] and signed for Essex on a two-year contract.

In April 2014 he re-joined Kent as an assistant to head coach Jimmy Adams, having left Essex in order to return to his "home club".

[14][15][16] After Adams left Kent in October 2016 to return to the Caribbean, Walker was appointed head coach of the club in January 2017.