A woman suspected of killing a friend was last night admitted to hospital after consuming rat poison. Police were hoping to learn from the suspect, surnamed Ling, 31, how her friend, a 33-year-old woman surnamed Ng, died. About 11.30am, the suspect's cousin dropped by and saw Ng lying unconscious on the floor in the living room of the home in Lung Lok House at Wong Tai Sin Lower Estate. She called the police, who found bruise marks on Ng's neck. Ling became hysterical and took rat poison before the officers arrived. The women were rushed to Queen Elizabeth Hospital, where Ng was certified dead. Ling was in serious condition last night.