An Ingham County teenager faces the possibility of life in prison after being convicted of murder in the stabbing death of his sister's boyfriend. Nineteen-year-old Connor McCowan of Okemos was found guilty yesterday in the death of 23-year-old Andrew Singler. His sister admitted she lied when she told McCowan that Singler had beaten her up. McCowan was convicted of second degree murder. Sentencing is set for Nov. 6th.