Actually, Tiller's site explained that he would use an injection to cause the baby to die "peacefully" before birth. The injection was Digoxin, which causes the heart muscle to contract. An overdose, injected into the heart, causes the muscle to contract violently enough to rip it apart. Then Tiller would induce labor to deliver the dead baby. (Thereby, of course, proving the BIRTHING the baby wasn't the problem, the problem was birthing a LIVE baby.)