http://www.kpho.com/news/25448360/detail.htmlTucson police arrested a woman Tuesday night in the death of her 2-year-old son.
Officers said Crystal Lopez, 30, was booked on charges of first-degree murder and child abuse.
Investigators said the babysitter called 911 on Sept. 30, saying a child fell off a stool and wasn't breathing.
Officers said Ethan Cunningham was taken to the hospital where he later died.
Doctors who examined the child said it didn't look like he fell.
Detectives said they have medical evidence showing the boy was hurt before he was left with the babysitter.