Johnny Depp once attempted to smother his wife, Amber Heard, with a pillow, a friend of the actress has claimed, as the couple's divorce becomes increasingly venomous. Heard, 30, filed for divorce from Depp, 52, on May 23.She has accused him of domestic violence and appeared outside court sporting what seemed to be a large bruise on her face, and has taken out a restraining order.A friend of Heard told The New York Post that the actor attacked her in December, resulting in the friend receiving a desperate text message calling for her help."I got to her apartment to find her with a cut and bruised lip, a swollen eye and a chunk of hair missing from the top of her head," the friend said. Depp movie and marriage on the rocksAmid domestic violence allegations, Johnny Depp's latest film, the Disney sequel Alice Through The Looking Glass, has had a disappointing opening weekend at the US box office. Depp 'off his head on drugs'A Friend tried to shield Amber Heard from husband Johnny Depp during a drunken rampage, according to papers filed as part of her application for a domestic violence restraining order.Amber sends Depp a Dear JohnnyJohnny Depp's wife has filed for divorce, citing irreconcilable differences, after 15 months of marriage to the Hollywood star."This incident really stuck with me because she confided in me that day that she feared for her life after an intoxicated Johnny tried to suffocate her with a pillow."The friend told the paper that Depp was frequently violent."I have personally witnessed the aftermath of Johnny Depp's violent and abusive behaviour towards her on many occasions," the confidante said.The pair married 15 months ago, having met in 2009 on the set of The Rum Diary.Depp's lawyers have denied the domestic violence claims...