
Lutan picked Tasha Yar as his First One which would have demoted Yareena to Number Two as I understand it. Yareena challenged Tasha Yar to the right of supercedence which is supposed to be a fight to the death, similar to the Vulcan Kal-if-fee challenge. Anyway at the end they claimed she died which dissolved the marriage and she got to keep her property and picked a different First One causing Lutan to lose her property.
PICARD: Exactly what do you find unfair, Lutan? They fought to the death. You saw the final blow. You know the effects of your poison.
...
LUTAN: She is not dead! There was no death combat. You violated our agreement. There will be no treaty, no vaccine!
PICARD: The challenge was carried out. She died, Lutan.
LUTAN: There was no challenge! She lives!
CRUSHER: I am a physician and saw her die. If you doubt this poison, why don't you test it on yourself?
PICARD: Lutan, we can provide you with records of her death and how Doctor Crusher brought her back.
YAREENA: And at the instant of death, Lutan, a mating agreement dissolves.
LUTAN: But this is witchcraft, Yareena. To discard a mate in this manner
YAREENA: Is less painful than the one you selected for me.
Lutan was not very skeptical about Yareena's death. Did she really die? Providing death records and surviving a poisoning that the Ligonians don't have a cure for is not technically proof of death. There's a difference between death and saving someone from the brink of death. Could the crew have been being deceptive about her death in order to get the vaccine?
My own idea of death occurs after the heart stops, brain death and there's no reasonable potential left to revive them. Given that they planned to treat Yareena immediately after being poisoned before that point of no return was reached, that didn't seem very dead to me.
http://www.livescience.com/46418-clinical-death-definitions.html
TNG "Where Silence Has Lease"
DATA: What is death?
PICARD: Oh, is that all? Well, Data, you're asking probably the most difficult of all questions. Some see it as a changing into an indestructible form, forever unchanging. They believe that the purpose of the entire universe is to then maintain that form in an Earth-like garden which will give delight and pleasure through all eternity. On the other hand, there are those who hold to the idea of our blinking into nothingness, with all our experiences, hopes and dreams merely a delusion.
Voyager "Mortal Coil"
PARIS: He's dead. No heart beat, no synaptic response, extensive cell damage to his brain.
CHAKOTAY: Try a cortical stimulator.
PARIS: It won't work. His neural pathways were disrupted by the protomatter.
CHAKOTAY: Set the stimulator for an autonomic bypass. At least we can get his vitals going.
PARIS: It's too late for that. The damage was too severe.
...
SEVEN: Then it's not too late to reactivate him.
PARIS: What are you saying? You can bring Neelix back to life?
SEVEN: That's precisely what I'm saying. The Borg have assimilated species with far greater medical knowledge than your own. We are capable of reactivating drones as much as seventy three hours after what you would call death.
CHAKOTAY: Neelix wasn't a Borg drone.
SEVEN: We will adapt.
EMH: What does this procedure involve?
SEVEN: Nanoprobes are used to reverse cellular necrosis, while the cerebral cortex is stimulated with a neuroelectric isopulse.
EMH: But there's nothing left to stimulate. His brain functions are gone.
SEVEN: By your narrow definition, perhaps, but not by mine.
TNG "Skin of Evil"
PICARD: What's Lieutenant Yar's condition? Doctor Crusher, report!
CRUSHER: She's dead.
CRUSHER: I need her in Sickbay now.
[Bridge]
PICARD: Go to Yellow Alert, Lieutenant Worf. I'll be in Sickbay.
WORF: Aye, sir.
[Sickbay]
PICARD: Status, Doctor?
CRUSHER: Unchanged.
PICARD: Can you bring her back?
CRUSHER: We'll see. Neural stimulator.
NURSE: Neural stimulator locked in.
CRUSHER: Interlock current feeds. Set sensitivity factor to four point four.
NURSE: Affirmative.
NURSE 2: Monitoring two point three, one point eight.
RIKER: You did it.
CRUSHER: No. I've got her on full support. There is no independent brain function.
NURSE 2: Current feeds operating.
NURSE: She's not responding, Doctor. Her synaptic network is breaking down.
CRUSHER: Inject norep.
NURSE: Neurons are beginning to depolarise.
CRUSHER: Let's go for direct reticular stimulation.
NURSE: Direct?
CRUSHER: Do it! (Tasha jerks from the shock) Increase to seventy microvolts.
(Tasha moves less this time)
CRUSHER: Eighty five microvolts. (nothing) Again. (still nothing) Ninety. Again. Again. She's gone.
PICARD: Gone?
CRUSHER: There was too much synaptic damage. That thing just sucked the life right out of her. There's nothing I can do.
Voyager "Coda"
CHAKOTAY: The Captain's dead. We have to get her back to sickbay. The Doctor may still be able to revive her.
TUVOK [OC]: The away team should be with you in minutes.
CHAKOTAY: Acknowledged.
JANEWAY: I know you can't see me or hear me. I don't know what's going on. But I am here, Chakotay. I am not dead.
CHAKOTAY: Kathryn, we're going to get you back.
[Sickbay]
(Chakotay is there while the EMH and Kes work on the dead Janeway. Janeway watches.)
EMH: Ten milligrammes cordrazine. We'll use it in conjunction with the cortical stimulator. Now!
KES: No pulse, no blood pressure. Minimum electrical activity in the midbrain. No measurable response in the cerebral cortex.
EMH: Again.
KES: Doctor, we're getting a thready pulse.
EMH: Quickly. Seventy five milligrammes inaprovaline. I'll begin direct synaptic stimulation.
KES: Pulse is weakening. We're losing her again.
EMH: Cortical stimulator. Now!
KES: No vital signs. No brain activity.
EMH: Again!
KES: No change.
EMH: Again!
KES: Doctor
EMH: Don't question me. Again! Make a note in the log. Death occurred at oh three twenty hours. Cause, massive cerebro-vascular collapse.
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