The murder bridge?

When the announcer says the name of the map there is a rare chance she will say murder bridge instead of Howling Abyss. It's an easter egg, not an official change.

ARAM was usually played on the old tutorial map, which people called murderbridge because it's a bridge on which you commit murder.

The name carried over to HA.

Murder Bridge is a community created name for the map that ARAM is played on, due to the objective being less about taking dragons/towers/etc. and more about killing each other 50 billion times. Originally it was given to the map that we used before the Howling Abyss replaced it. The Howling Abyss is essentially a skin of that map (with minor differences), and thus the name carried over to the Howling Abyss. The announcer will sometimes call it the Murder Bridge as a fun easter egg.

It's one of the many names the cold Bridge has. It's simply an easter egg implemented with one of the Announcer's quote.

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when did the howling abyss become the murder bridge? Thats just.. awkward. It has no ring to it

Bro, Howling Abyss didn't become MurderBridge. MurderBridge became Howling Abyss.