So I was bored and decided to take a gander at who on the Astros leads the team in walk-off homers. Results follow the ellipses...
Miguel Tejada - 271 career homers / 5 walk-offs
Carlos Lee - 284 / 4
Pudge Rodriguez - 296 / 3
Darin Erstad - 122 / 3
Hunter Pence - 46 / 2
Lance Berkman - 292 / 1
Jason Michaels - 45 / 1
Geoff Blum - 85 / 0
Kaz Matsui - 24 / 0
Jason Smith - 17 / 0
Jeff Keppinger - 14 / 0
Michael Bourn - 6 / 0
Humberto Quintero - 5 / 0
And just for grins...
Jeff Bagwell - 449 / 3 (surprising, no?)
-April 18, 1992 vs. SD
-Sept 15, 1992 vs. SFG
-June 3, 1997 vs. LAD
All three were in extra innings, and at the Astrodome
Craig Biggio - 291 / 3
-June 5, 1995 vs. FLA
-May 16, 1998 vs. ATL
-July 31, 2001 vs. NYM