My death animation cant execute exactly for once. The when the player hp is zero then death animation starts but it continues without stop. so how to stop animation after death.

according to help files:

'Animation duration. You can set the animation to play for a certain time and then stop. Set this value to zero to play forever. This feature can be used, for example, to play an animation only once, by setting the proper time, depending on animation speed. Time value is in seconds and decimal values, like 3.731 (3 seconds and 731 thousands-of-second) are valid.'