Minecraft wiki entry for Death_messages, associated text: <player> suffocated in a wall
Appears when the player is killed because they were inside of a non-transparent block.
<player> suffocated in a wall whilst fighting <player/mob>
Appears when the player is hurt by a player or mob then killed by suffocation damage.
<player> was squished too much
Appears when the player is killed by the maxEntityCramming gamerule.
<player> was squashed by <player/mob>
Appears when the player is hurt by a player or mob then killed by the maxEntityCramming gamerule.