Play animation only if its standing on the ground

I am creating a melee game, 1vs1 mode. When the player has <= 0 health, he gets disabled and a death animation gets played. But the problem is: If my player jumps, then gets a deadly $$anonymous$$t, he dies floating above the ground. I tried many t$$anonymous$$ngs, such as groundcheck or checking the rigid.velocity before playing the death animation, but all the t$$anonymous$$ngs did not work. I hope you can help me.