( CNN ) -- Las Vegas police caught two people as they were about to board a plane for Colombia , then charged them with the murder of a woman who went missing hours after being dropped off for a cosmetic surgery procedure . The female victim was dropped off Saturday morning to undergo a cosmetic procedure , according to a statement from the Las Vegas Police Department . The victim 's daughter contacted police after she was unable to find her mother at the same location where she had dropped her off about eight hours earlier . A police report , obtained and posted online by CNN affiliate KLAS , quoted the daughter as saying the office did not even have the same furniture in the office as was there earlier in the day . The report claims that , before she left originally , the daughter saw the victim , identified as 42-year-old Elena Caro , disrobe and be injected in the buttocks by a man later identified by the daughter as one of the suspects , Ruben Dario Mattallana-Galvas . The daughter told police she got a call about an hour later from her mother , and was told to return several hours later . In that span , authorities learned that the woman had been picked up in an ambulance about three miles north from the original location and taken to a local hospital . There , she was pronounced dead , according to the police statement . Las Vegas police detectives soon identified two suspects as Mattallana-Galvas , 55 , and Carmen Olfidia Torres-Sanchez , 47 . Both are from Medellin , Colombia . The pair were arrested Saturday night at McCarran International Airport , while preparing to board a flight for Colombia . The pair actually had tickets for April 22 , but were hoping to leave the United States earlier , according to the police report . Instead , they were taken to the Clark County Detention Center and each charged with one count of murder , police said . Mattallana-Galvas and Torres-Sanchez are due to be formally arraigned in court Tuesday on the charges , according to Las Vegas police . After being informed he was being arrested for murder and being read his Miranda rights , Mattallana-Galvas told detectives that Caro had come into his office that day for a buttocks enhancement procedure , the police report stated . He claimed that , afterward , Caro had walked away from his office . Mattallana-Galvas admitted to authorities that he was not licensed to pr active medicine in Nevada , but claimed he was a homeopathic doctor in Colombia . Also Saturday , Las Vegas detectives interviewed an assistant to Mattallana-Galvas , who claimed that Mattallana-Galvas told her to cancel his appointments for that afternoon because `` something had gone wrong , '' the police report said . The assistant said that her husband eventually took Mattallana-Galvas to the airport . The toxicology report examining the exact cause and timing of Caro 's death is still pending , John Fudenberg , the assistant coroner for Clark County , said Monday evening . CNN 's Marlena Baldacci contributed to this report .
NEW : The victim 's daughter says her mother was injected by one suspect . NEW : A suspect says the woman left off after getting a buttocks injection . Two Colombian nationals have been charged with murder in Las Vegas . They were caught as they were about to board a plane for South America .