Hephaestus.
It was crafted by Hephaestus and was a golden armour said to be as bright as the sun and was the best armour ever made.
Ajax would still not speak to Odysseus in Hades, as he was still angry at Odysseus over the battle for Achilles' armour.
Achilles appeared to Ulysses in The Odyssey. He gave him a speech in hell and told Ulysses that life was more important than glory or money.
Achilles' primary weapon was the spear. He carried an unusual spear which Homer describes as too big for any other warrior to wield successfully. When Patroclus wears Achilles' armour, Homer makes a point of saying that he takes a different spear. He also uses a sword, but it secondary to the spear. He arms in a cuirass, greaves, bronze helmet and shield. His second set of armour (made by Hephaestus after Hektor has taken Achilles' first set from Patroclus' corpse) is more fantastic and beyond the technical skill of the Mycenaeans (who's age Homer describes), but is the same in terms of items.
Hephaestus.
Ajax
Odysseus and Telamonium Ajax compete for the armour; it is eventually given to Odysseus. Odysseus ends up giving the armour to Achilles' son, Neoptolemus.
It was crafted by Hephaestus and was a golden armour said to be as bright as the sun and was the best armour ever made.
Patroclus was Achilles cousin and was killed in the Trojan War by Hector. He was killed while wearing Achilles armour.
Armour at the request of Thetis, the mother of Achilles who had saved Hephaestus when Hera threw him from heaven as a babe for being lame/ugly.
For Thetis, the mother of Achilles, and his rescuer when Hera threw him from Mt. Olympus, he build the Armour of Achilles.
At the time, this was an unknown consequence.
Armor . He didn't steal it, taking a fallen foe's armour was recognised by both sides as a tophy the victor was entitled to.
Ajax the greater killed himself after realizing he killed animals.
gave him achilles' armor
Patroclus (in the Iliad) was killed by Hector - who had mistaken him for Achilles (Patroclus had borrowed Achilles' armour). So if the question is: 'Who did not kill Patroclus?' the answer is: everybody except Hector (Aeneas, Troilus, Sarpedon, Calchas, Hecuba .....).