Deaths

The player can experience 8 deaths in Five Nights At Deathly's. The death of the player is the player being stuffed into a Toy Deathly suit, without getting stuffed into a Head, meaning your head remains. The Game Over screen shows Dylan Schmidt stuffed into a suit, lying in a slumped position similar to Golden Deathly, while the suit hand holds a Toy Deathly head.

Standard Animatronics
The Toy animatronics crawl through the vent and the player can either close the flap or put on the Mask. If the player puts up the monitor and lowers it when they are in the Front Vent blind spot, the player will be killed.

As for Old Animatronics, they will get into the Hallway vents, then the Hallway Corners, then they come into your office with the lights flickering, You must put on the mask as soon as you see them, or close the door when they are in the Hallway Corners. If the player does not put on the mask in time, the player will die.

Trivia
The player/Dylan is actually lucky in a way; he is not forcefully pressed into a suit head like Mike Schmidt.