In my 30 years as a runner (i'm 37) I have never found a dead body while running.
While running I have:
I've found money (including $20 five different times)
I've found condoms (new and used)
I've found the remnants of a Satanic cult ceromony - no body but alot of blood and symbols.
I've found an old grave site of a family in the middle of the woods but they had been buried for 150 years before.
I've been attacked by both animals (dogs, 1 cat and 1 squirrel) and people.
I was propositioned once by a "lady of the evening" in South Beach on my 5 am run
I have come upon a fist fight (twice)
I have come upon people having sex (in the woods near my trail)
I have witnessed sex acts performed in parked cars
I have seen people get hit by cars (no deaths I know of)
I have seen car accidents (some fairly bad)
I have found suitcases full of clothes
I have found people by themselves crying
I have seen naked people hiking (but they had shoes on)
But never once in my 30 years I have found a dead body while running.
I guess I should consider myself lucky.