A Brazilian man accused of murdering and dismembering a British girl has apologised to her mother. Mohamed D'Ali Carvalho Santos, 20, was charged with killing 17-year-old Cara Burke after her torso was found in a suitcase dumped on a riverbank. After a four-hour police interview, in which Santos reportedly confessed to the crime, he was asked if he had anything to say to the girl's mother. He replied in English: "Tell her I am sorry. I did not know what I was doing." He also claimed he was so high on cocaine he could not remember what happened. But officers said he killed Miss Burke after she threatened to tell his parents he was a drug dealer. Santos has taken specialist officers to a river to help them locate the rest of her body. And Police have revealed they are looking for another suspect who might have helped Santos get rid of Miss Burke's head and other body parts. Police claim he placed her severed head on top of her torso in the manner of a Taliban execution, and took photographs on his mobile phone. Santos also spoke to a Brazilian local newspaper and said he dismembered the corpse so he could remove it from the apartment, adding: "The best method I could think of was putting her inside the suitcase." And asked why he allegedly took photographs, he is reported to have said: "I took them in order to send to a Brazilian in England, who she stole money from. He said he was going to kill her. "I was going to send them by email to show him that although he didn't have the courage to do it, someone here did." Miss Burke's mother, Anne, described her daughter's killer as a "monster". She said: "I'll never recover from this. My baby is in bits, they can't even find her. I need her back, I just want to get my baby back where she belongs. "That monster has taken my girl. He took her life and I want his. She wasn't an angel but she didn't deserve that." The teenager met Santos when he was living in London and travelled to Brazil with him several months ago.