We didn't see him whacked, but it doesn't mean that he wasn't. But, it's a good question:

You might argue that, although Cicci identified Michael as the head of his crime family, in a key part of his testimony he said he never got a direct order from Michael--which meant that he did not directly implicate Michael in any crimes that he (Cicci) took part in. On the other hand, since the subcommittee kept Pentangeli's survival secret to trap Michael into five counts of perjury, Cicci's testimony that he never fot a direct order from Michael emboldened Michael to lie under oath, thinking that no one else could implicate him. So, though Cicci almost certainly didn't know they were going to use Pentangeli as a witness, he was inadvertently part of the perjury trap.