The suspect in the fatal CTA stabbing allegedly robbed the victim and had four probation violations with an ankle monitor at the time of the attack.
https://www.foxnews.com/us/transit-worker-allegedly-killed-felon-electronic-monitoring-despite-repeated-probation-violations
https://www.foxnews.com/us/transit-worker-allegedly-killed-felon-electronic-monitoring-despite-repeated-probation-violations