Minecraft wiki entry for Death_messages, associated text: <player> drowned
Appears when the player runs out of air underwater and is killed from drowning damage.
Also appears in the game's log when a named blaze, enderman, strider or snow golem takes lethal damage from being in water, and when a named cod, salmon, pufferfish, tropical fish, squid or glow squid takes lethal damage from being out of water.
<player> drowned whilst trying to escape <player/mob>
Appears when the player is hurt by a player or mob then dies from drowning.
Also appears in the game's log when one of the aforementioned mobs is hurt by a player or mob then dies from drowning.