DENVER (Reuters) - An American mother who told police her 13-month-old son drowned in the bathtub while she was playing a game on Facebook was charged on Friday with child abuse resulting in death. Shannon Johnson, 34, of Colorado was advised of the charge against her via a video hookup from the jail where she is being held on a $100,000 bond, said Finch, spokeswoman for the Weld County District Attorneys Office. Johnson requested a public defender during the brief hearing and another hearing was set for later, Finch said. Under questioning by police after the boy died at hospital last Sept, Johnson admitted she placed the baby in the bathtub and went into another room to play the Facebook game Cafe World.