Hitchhiker's: Mostly Harmless Ending

I finished all the books, but I barely remember the ending.  Agrajag dies again.  Ford is laughing like a maniac.  But then Arthur is about to die, somehow..?  I don't remember.  Refresh my memory.

What bothered me the most was Fenchurch's disappearance.  Felt it was a sloppy way to get rid of a character.

SPOILER! SPOILER!

um.....not the last book dumbfag...the last one is So Long and Thanks For All The Fish and it ends with Arthur and that one girl he met on earth and got together with (not fenchurch) and them 2 and Marvin had just read God's Last Message to his creation