Unfortunately, in PF/D&D, that usually IS the best way to deal with a dominated teammate once you have access to revivification magic.
If (ding, dong) the witch is dead, then she can't issue you more commands, and you're effectively freed from the domination. The Dominate Person spell lasts 1/day per level, so eventually it will end.
If the witch is still alive ... you're probably still under her control. Nothing in the rules says that dying ends effects automatically; only ones that say they end when the caster or victim falls unconscious/dies/etc will end at that time. You should be restrained until it wears off.
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Did they not have their own save-or-suck to hit you with so you wouldn't be a threat? Or Dispel Magic? Or Protection from Evil (which suppresses but does not end a current mind control effect, allowing them to bind you while you're still yourself until they can find a more permanent solution? Or anything at all capable of nonlethally restraining an equal-level opponent? Or did they try these and fail?
Sounds to me like bad luck, bad planning, or both.
Most spells on a person end when that person dies, they are a corpse and not a person/creature. It's not dominate object after all. So, if you cast permanency on yourself and die, that's gone. Your buff spells on allies or other spells in effect end at their normal duration. Your party could have just knocked you unconscious and cast protection from evil on you though. Or used breath of life, or dispel magic, or dispel evil, or put you in an antimagic field....etc. etc. etc.
Nothing says the target of a spell has to remain a legal target afterwards, nor that the duration ends when the target dies.