After searching constant hours for the beautifully written song, I decided to make my own. 
I believe this is how he plays it. Please do let me know if you like it! This is played 
in STANDARD TUNING with NO CAPO. 

Gadd9 Dsus4 Cadd9

 Gadd9         Dsus4  Cadd9
    Katie was a looker,     the finest thing I'd ever seen.
Gadd9                  Dsus4        Cadd9
  I got the courage, to ask her out        when I turned eighteen.
Gadd9        Dsus4 Cadd9
  Saturday, 8'oclock    and not a minute late.
Gadd9               Dsus4              Cadd9
  I pulled up in my beat up truck, and we headed towards the lake.

 (Chorus 1)
            Dsus4       Cadd9             Gadd9
  She said,      "Boy I sure do love your smile.
       Dsus4       Cadd9                Gadd9 
 And I hope we can stay here for awhile.
Dsus4            Cadd9           Gadd9 Dsus4 Cadd9
 But to tell the truth, I always knew.
         Am         Dsus4          Gadd9
 I'd end up with a country boy like you."
Gadd9        Dsus4             Cadd9
 A few years down the road, we both said, "I do."
Gadd9              Dsus4             Cadd9
 Then we left that sleepy little town     on a honeymoon cruise.
 Gadd9           Dsus4   Cadd9
 Soaking up the sunlight,      and dancing on the beach.
 Gadd9            Dsus4         Cadd9
 I could feel the love she felt,      when she looked at me.

 (Chorus 2)
           Dsus4       Cadd9             Gadd9 
 She said,      "Boy I sure do love your smile.
       Dsus4       Cadd9                Gadd9 
 And I hope we can stay here for awhile.
 Dsus4           Cadd9           Gadd9 Dsus4 Cadd9
 And to tell the truth, I always knew.
          Am         Dsus4          Gadd9
  I'd end up with a country boy like you."
Em7                     Dsus4 Cadd9                Gadd9,D/F#,Em7
  I got a call at about 7:15,      from a hospital room.
             Dsus4               Cadd9
 I heard the nurse on the other end say, 
Em7                     Dsus4         Cadd9
"I know it's hard to understand, but get here just as quick as you can. 
 Am                        Dsus4 (w/hammer)
 There's been an accident."
Gadd9              Dsus4  Cadd9
  I'm here at her bedside,     and trying not cry.
Gadd9                 Dsus4            Cadd9
  The doctor said, "She ain't got long,      time to say goodbye."
Gadd9              Dsus4           Cadd9
  Katie opened her soft green eyes,      and she looked at me.
Gadd9           Dsus4            Cadd9
  I moved closer by her side, and I got down on my knees.

 (Chorus 3)

               Dsus4 Cadd9              Gadd9
  And I said, "Girl I sure do love your smile.
        Dsus4           Cadd9                 Gadd9
  And I know you need to go in a little while."
Dsus4             Cadd9           Gadd9 Dsus4 Cadd9
  But to tell the truth, I always knew.
               Am          Dsus4     Gadd9 
  I'd fall in love with an angel like you."

 Dsus4 (w/hammer) to Cadd9 (pick walkdown) to finish on Gadd9