He was launched as a matinee idol, via the movie Bagets 2 along with William Martinez, Herbert Bautista, Raymond Lauchengco, JC Bonnin, Ramon Christopher and the late Francis Magalona.
The last film he appeared in was Mancao with his uncle Phillip Salvador, which was post-humously shown and dedicated to his memory in 1994.
After retiring from his showbiz career in 1993, Jonjon and his friends came home from an out-of-town trip.
On the morning of November 7, Hernandez met a untimely death when his car crashed into the concrete barrier.
[3] His remains was laid to rest at the Loyola Memorial Park together with other celebrities such as Julie Vega, Jay Ilagan, Nida Blanca and Francis Magalona.