The Palestinian who stabbed an elderly woman to death in Herzliya this morning was a former Shin Bet informant, the security agency says. According to the Shin Bet, the suspect was involved in uncovering terror networks in the West Bank, before his cover was blown. He was then transferred to Israel for rehabilitation. He was shot and detained at the scene of the deadly stabbing. The Shin Bet says it will question the suspect to investigate the circumstances of the terror attack.