Rihanna's "Emergency Room" Song

In a shocking revelation, pop star Rihanna had been working on a song about murdering a cheating partner when she was allegedly involved in a violent altercation with her boyfriend Chris Brown Sunday night in Los Angeles.

England's The Sun reports that The Umbrella singer had been collaborating with rapper AKON on a track called Emergency Room, which centres on a woman intending to wreak violent revenge on a partner who she has discovered is being unfaithful.

Earlier, RadarOnline.com reported that sources say Rihanna had intercepted sexually explicit text messages sent to Brown by another woman, and that led to their fight.

According to The Sun, Rihanna's song -which has been leaded on the internet -- includes a verse that says: "I'm going to leave your heart broken on the floor/ You're gonna be in the emergency room/ I'm standing by your bed/ And so tempted to pull out your IV."

In another verse, Rihanna sings: "Tryin' to call a nurse but nobody can help you now/ Let me see you try to live without me/ Now where's your heartbeat? / Flat line on the ECG".

The track also recounts the moment when the deception is discovered. "I gotta say I found this a bit shockin'/ It's on receipts to tell you went shoppin'/You bought some Nike shoes/ But why you buying stockings?"