KILLED AND LOST MY NETHERITE SWORD

this one guy called washingmachine i think he killed me with lava and took my netherite sword and my crazy ass pickaxe. i was afk so like i didnt see thought but when i came back to my screen it said i died because i was burnt to death and  a bunch of other people know. like this dude names NIRU04 or something and this dude called BaDAM and another reason i think it was him is cuz when BadAM was dropping me my stuff when i died he was like right beside me trying to pick it up so please do something about this