Marie Johnson, a high school math teacher in Livermore, was arrested for allegedly having sex with a student.
One day after a San Jose elementary teacher was booked in jail on child sexual assault charges, a high school teacher in Livermore faced the same charge.
Livermore police said they received information on Tuesday about some alleged inappropriate behavior between teacher Marie Johnson, 40, and a 15 year old boy.
Johnson teaches at Granada High School. Parents there were informed of her arrest Wednesday. Many said they were shocked because she was a very popular instructor.
One senior said he felt bad for Johnson's son, who attends Granada.
According to investigators, the sexual assaults took place during a six-month period beginning in December 2010 and ending in May 2011. The relationship was initially formed through text messages, Facebook and the game "words with Friends," police said.
The principal of Granada said the school does not have a policy on Facebook.
An arraignment is scheduled Tuesday Jan. 17.
Police do not believe there were any other victims, but if anyone has details on the case they are encouraged to call Livermore police at 925-294-7531.