SPRING VALLEY, New York (WABC) -- A woman has died after she was stabbed repeatedly inside a library in Spring Valley on Tuesday afternoon.The incident was reported at the Finkelstein Memorial Library on Chestnut Street just after 2 p.m.The 52-year-old female security guard was sitting at her post on the third floor when with no warning, a man attacked her with a knife.When the victim screamed she couldn't breathe, onlookers attempted CPR as two library patrons wrestled the attacker to the floor so police could take him away.Witnesses said the attack was horrific to watch and the man had a smirk on his face.The woman was rushed to the hospital where she was pronounced dead."It's just a profound loss for us, it really really is," said the victim's friend Christine Ball.It is not yet clear if the man knew the security guard or if the attack was random."It's just unbelievable, this is a place where people bring their children and family and they sit and enjoy the library," the victim's friend Oney Barron said. "This is a place where it should not be where we're going to need additional security just to protect us."The suspect, a 25-year-old Spring Valley resident, was taken into custody. The investigation is ongoing.Sen. David Carlucci, D-Rockland County, released the following statement:----------