Avengers Disassembled
In Avengers #500 (now back to its original renumbering) at the onset of the "Avengers Disassembled" event, Jack reappeared in uniform as what appeared to be a zombie just long enough to blow himself up, killing Scott Lang and destroying half of the Avengers Mansion. Jack's return was caused by the probability-shifting powers of the Scarlet Witch through methods that have remained ambiguous. Unlike his prior explosion in space, Jack's body was never recovered from the ruins.
Read more about this topic: Jack Of Hearts, Fictional Character Biography