the deputy's apology and ongoing investigation into his credentials. >> 73-year-old robert bates charged with second degree manslaughter after he used his pistol instead of a stun gun killing eric harris. in an interview with nbc's "today" show, bates can't believe it happened. >> first and foremost, let me apologize to the family eric harris. the second worst thing or first that ever happened to me in my life. i had cancer a number of years ago. i didn't think i was going to get there. luckily i was able to go to a hospital where i had hours of surgery. i rate this as number one. on my list of things in my life that i regret. >> bates, a volunteer with the sheriff's department for several years says he can't explain why