Time Travel trying to stop the Kennedy assassination

[Guest]

guy goes back in time and ends up in jail for assassination

his girlfriend goes back to "before" when the guy got there and gets hit by a car

then the "scientist" goes back

plot line that the guy goes back in time to a period when he also existed as a child and the longer he (the older version) stayed in that time the sicker (and ultimately dead) the younger one became.

What was the name of this please?

[Guest]

Seems that it was "A Time To Remember" by Stanley Shapiro

[alakshak]

Thoug not the same book, "Joshua, Son of None" was about a president being assassinated, and whom scientists cloned and raised with the same life the president had lived, in order to duplicate him not only physically, but in character. He grew up and ran for president. (Ending not given here.) The description so clearly matches John F. Kennedy. I am amazed that it didn't seem more popular.

(Also amazed that people assumed there have been no cloned people for the last 30 years. Though I don't know, I would not assume there are none.)

Not your book, but engrossing to read.)