Death wobble is the uncontrolled oscillation of the front axle.
First place to start is the trackbar. Make sure the bushing at the axle end is in good shape, mount hole not wallowed out, torqued properly. Joint at the frame needs to be in good shape. Any part that locates the axle can contribute and cause death wobble.
Anyone who mentions a steering stabilizer, tires, alignment, brakes or wheel bearings needs to think about the logic behind their argument.