Can you die in quicksand

Yes, but it depends on certain things. True quicksand is water coming up from the ground that saturates the dirt or sand particles making them float in the water. When you step in, you can get stuck. More so if you struggle. With real quicksand, at a point, you start to float so sinking over your head would be pretty hard to do. Now here's what could happen, if the water stops flowing upwards, all of the suspended particles will clamp around the part of your body and make it pretty hard to move. Depending on how deep you are depends on how long it will take you to get out. So if you are up to your knees, getting out will be much easier than say your waist deep. Worst case scenario, you were up to your shoulders when this happened making it difficult if not impossible to breathe.