It depends, If you are about to die and you are low on chakra, your chakra is so weak that it can't support the seal. Then, the seal is broken and the Jinchuuriki (if not friendly) will go on a rampage. If it is friendly, I don't know.
Also, If he lets say gets killed instantly and his/her body is gone (exploded or destroyed into bits or thin air) it will be soon come back to life after it takes onto another person and the cycle of the jinchuuriki will repeat again.
Now, you're thinking, WTF HAPPEN TO SHUKAKU (Gaara's Tailed Beast/One-Tailed Beast), there is a chance that Tobi used all of the Shukaku's chakra into the Gedo Mazou since Tobi can't control too much chakra at once. Then, you're thinking, "How come he can control the 10 Tails and the other Tails, excluding Naruto and Bee). Its because Tobi brought the Jinchuurikis back to life and so that they also control the beasts with Tobi, but Tobi has most of the control. I don't know if you understand what i'm trying to get at.
So there you have it folks. Got More Questions? Email me,
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