Lawrence Warunge tried to murder his family with carbon monoxide thrice unsuccessfully. He then tried to make his girlfriend Muthoni smoke bhangi and drink alcohol so that she could blackout and give him an alibi while he was on his killing spree but she refused. Muthoni will have all charges dropped as she's becoming a State witness against Mr. Warunge. Muthoni said that Waruge promised her a good life if she helped him but she declined to join him in the mission to kill his family. She says she helped him get rid of the evidence out of fears that he would kill her if she did not cooperate. Detectives say that there's no incriminating evidence against Muthoni, 23,an egg hawker at Biafra Thika besides the 9 inch knife she purchased. The man who rented the couple a room said that he had known Muthoni since childhood and she had a good character. Meanwhile Mr. Warunge had visited Uhuru Park and Holy Family Basilica on the fateful day, he had bought a wig, a doll and women's shoes. After the murders, he ate food his mother had cooked, watched TV and slept in his father's bed upto 4am when he left the scene of crime.