Chunk (Timothy)

Chapter: 4 · Care Center: Attic
Where: Care Center Attic (3F), west side: rafters, crates and narrow paths, 2 yellow ladders, a small back room to the northwest and an upper level to the southeast blocked by wooden panelling.

Weak point

The head (some guides add the belly and the hands).

Timothy B. Jackson, the brother who turned cannibal: when Leon arrives he's eating a dead guard. The fight is mandatory. The loop never changes: MSBG 500 to the face until he drops to all fours, Hatchet finisher, repeat. About 3 knockdowns with 3 finishers kill him.

Use the doorframes and rafters where he gets stuck, and let him smash the walls before you kill him: there's loot behind them that is lost if he dies first.

Reward

1 Hand Grenade, which unlocks the grenade recipes (Game8 says 2; Evil Resource, IGN and the wiki say 1). On later runs he's also worth 1,500 credits (wiki).

No published HP. Arena ammo on Standard: Handgun Ammo ×5 (southwest side path) and ×5 (central boxes), Shotgun Shells ×5 (northwest back room), ×4 up on the southeast level and ×4 behind the northeast wall, plus a Med Injector behind the north wall. Insanity and later runs: the MSBG 500 doesn't spawn, so buy a shotgun first (Connecting Passage Supply Box); in exchange there's a Hand Grenade on the west table, Scrap on the piano and Gunpowder (Large).

Step by step

Take the MSBG 500 from the floor next to him and the corpse (first playthrough only).
Backpedal and shoot him in the face: about 3 shells put him on all fours. Run in and press ZR for the Hatchet finisher to the face (heavy damage).
Go to the end of the small path on the right and wait: he wedges himself between the beams. Empty an Alligator Snapper magazine into his head while he's stuck.
Make him charge the wooden panelling near the start: breaking it opens the ladder to the southeast level (Shotgun Shells ×4).
Climb the yellow ladders to the rafters. When he climbs after you, shoot his head and hands: he falls and a leaping hatchet chop prompt appears (heavy damage).
Final phase: he thrashes and flops fast along the floor. Lead him down the narrow corridor so he breaks the 2 wall sections (Med Injector to the north, Shotgun Shells ×4 to the northeast), then stun him for the last finisher.
Once he spews blood from the holes in his body he's finished: stop shooting and wait for the explosion.