Minecraft – How to make a command block say the nearest player’s name in chat in MC Bedrock Edition

You can't specify a radius for the command /say. You should learn json and use /tellraw instead. If you want to send the message to everyone within a radius of 100 blocks, do /tellraw @a[r=100].

Basic JSON formatting: /tellraw @a[r=100] {text:"Hello world!"}

With colours: /tellraw @a[r=100] {text:"Hello world!",color:"aqua"}

These colours have different names than wool colours, for example cyan is dark_aqua. These names can be found on the Minecraft wiki here.

You can do lots more with JSON than you can do with /say. Check out this awesome json generator: https://www.minecraftjson.com/

First, you will need to turn off death messages: /gamerule showDeathMessages false

Then you will use command blocks to make your own death messages. The easiest way I can think of to do it, is to first make a kill player score and a death score: /scoreboard objectives add killPlayer playerKillCount and /scoreboard objectives add deaths deathCount.

Then you will need four command blocks:

• Repeating Command Block: /execute @a[score_deaths_min=1] ~ ~ ~ /execute @p[score_killPlayer_min=1,tag=!mafia] ~ ~ ~ /tellraw @a ["",{"selector":"@a[score_deaths_min=1]"},{"text":" was slain by "},{"selector":"@p"}]
• Chain Command Block: /execute @a[score_deaths_min=1] ~ ~ ~ /execute @p[score_killPlayer_min=1,tag=mafia] ~ ~ ~ /tellraw @a ["",{"selector":"@a[score_deaths_min=1]"},{"text":" was slain by the Mafia"}]
• Chain Command Block: /scoreboard players reset @a killPlayer
• Chain Command Block: /scoreboard players reset @a deaths

By the way, the @a[c=1] is necessary because @p does not select dead players. The first command will do death messages for non-mafia players, the second for mafia players, then the last two reset the scores so the message only displays once. Make sure to change tag=mafia and tag=!mafia to whatever you are using to identify the mafia players.

Hope this helps! :D