Although spiritually I believe that this is wrong -- a sin against God -- and thus would not make this choice. However this is a free country and as such, I think that this too should be a freedom that no one should be able to take away from the individual. Perhaps have laws set up strict rules about how doctor assisted suicides can be conducted, such as having the patient sign some legal document (like a living will), a mental check to ensure that the patient is in their right-mind when making the decision, and having the patient perform the actual act (the doctor can prescribe the euthanizing drugs, but it'd be up to the patient to choose to take those drugs) so that the doctor's hands are clean.