In Edward II, death imagery is not overt and it is divested from any supernatural or spiritual believe in the hereafter, despite Marlowe's other Christian imagery. Marlowe's characters make "no creditible appeals to divine provinence."
The death imagery in The Revenger's Tragedy would be the skull that is kept in Vindice's monk's cell and the object of his obsession. Contrast the lavish opening scene of the court to Vindice's holding of the "shell of death," the skull of Glorianna. It is a momento mori (remember death is near.)