His name is Scott Roeder, and there is speculation that he has had ties with Operation Rescue.
Which is already leading to this sort of rhetoric from left-wing blogs/sites:
That, my friends, is what is known as talking out of one’s ass. And you know what? I don’t believe them. Not for one minute.
Police are now saying the 51 year old suspect in the murder of Dr. Tiller, Scott Roeder, (FreeStateDem broke this) was an isolated individual, but I hope the media tears the case apart to be sure of that because if he is connected at all, then we need to demand that the domestic terrorist group he might be associated with is treated like any other group in this country that supports – either directly or indirectly – terrorists. And if the media doesn't, then I trust some of you will take the case on. :P
Freeze their assets, interrogate their leadership (sans torture, because that's not what we're about) and bring this person (or people) to justice.
There is will be more of this—much more—in the days to come, I'm certain of it. And, sadly, Randall Terry is not helping matters at all. Not one bit.
Robert P. George has made an excellent statement on the situation.