The former Arizona Diamondbacks star opened up to the media in his first Chase Field appearance since leaving in free agency.

In his return to Arizona, Christian Walker said the Diamondbacks didn't make a formal offer to keep him in free agency.

Brice Matthews reaches first after a fielding error by Geraldo Perdomo, driving in Christian Walker to tie the game at 1 in ...

Christian Walker slams the Arizona Diamondbacks before his return with the Houston Astros for a key three-game series at ...

Christian Walker hit a go-ahead solo homer in the sixth inning as the Houston Astros rallied from an early three-run deficit ...

Christian Walker singled home the go-ahead run in the ninth inning and the Houston Astros beat the Arizona Diamondbacks 4-3 ...

Christian Walker conectó un jonrón solitario decisivo en la sexta entrada mientras los Astros de Houston se recuperaron de un ...

Christian Walker grounds an RBI single into center field, scoring Zack Short to give the Astros a 4-3 lead in the top of the ...

Christian Walker talks about his time playing for the Arizona Diamondbacks as he returns to face them for the first time ...

The Houston Astros just can't seem to figure out what to do at first base.  Unfortunately, that's continued to be the case with first baseman Christian Walker, whom they signed during the offseason.

Christian Walker looks on after striking out in the fourth inning on Monday. (Sarah Stier / Getty Images) Walker has become one of the most important players on this surging Diamondbacks team.