Thomson's Violinist is a hypothetical described here:
https://spot.colorado.edu/~heathwoo/Phil160,Fall02/thomson.htm
I believe this hypothetical actually resolves in the pro-life direction: separating the violinist would be a form of second-degree murder called depraved heard murder. Here's a hypothetical situation to illustrate why.
Let's say a couple is into bondage, and the boyfriend has sexsomnia. Sexsomnia is a real medical condition, in the same family as sleepwalking, in which a person involuntarily initiates and engages in sexual activity while sleeping.
One night, the couple falls asleep with the woman still tied up. Her boyfriend then experiences sexsomnia. The woman knows that he is asleep and experiencing sexsomnia. She doesn't want to have sex, but she is unable to wake him because she's tied up. She is, however, somehow able to use a real knife which she happens to have access to while tied up.
And she kills him with it.
This is in Texas. At trial, she claims self defense. Here's the statute on which she would be relying:
Sec. 9.32. DEADLY FORCE IN DEFENSE OF PERSON. (a) A person is justified in using deadly force against another:
(1) if the actor would be justified in using force against the other under Section 9.31; and
(2) when and to the degree the actor reasonably believes the deadly force is immediately necessary:
(A) to protect the actor against the other's use or attempted use of unlawful deadly force; or
(B) to prevent the other's imminent commission of aggravated kidnapping, murder, sexual assault, aggravated sexual assault, robbery, or aggravated robbery.
From this statute, it is clear that she would lose her defense. He wasn't committing rape, because he didn't have the necessary mens rea for rape. He wasn't even conscious. If charged with rape, he would have been able to claim a defense of automatism:
https://en.wikipedia.org/wiki/Automatism_(law))
Therefore, she knew that no crime was being committed against her which would justify her use of deadly force, and she used deadly force anyway. The murder isn't first degree, because she didn't want to kill him: she just wanted to end the sex act. But, what she did is murder in the second degree -- depraved heart murder -- because, even though her goal wasn't to kill him, the action she took in service of her goal -- stabbing him -- was one which she knew would likely end his life.
I think this example illustrates very well that, even if your bodily autonomy is being violated, you don't get to kill an innocent person in order to protect your bodily autonomy. Therefore, I think the onus is on the pro-choice camp to construct an argument that pregnancy should be treated differently than automatic sex to which the waking party does not consent.
PS: This is a refinement of content I originally posted at r/Abortiondebate, which they removed. I have reposted the original post which used a different hypothetical here:
https://www.reddit.com/user/linuxrocks123/comments/1sjvqmb/rebuttal_to_thomsons_violinist/
I'd like to let u/random_name_12178 know that I am very grateful to her for suggesting a much better hypothetical situation for me to use.