This is pretty atrocious police work and makes you wonder if even today how well these criminals with ankle monitors are being tracked:
A Seoul court on Wednesday ordered the state to pay more than 200 million won (US$162,500) in compensation to family members of a woman killed after an attempted rape by a man wearing an ankle monitor for sexual crimes.
In 2012, the woman in her 30s was murdered by Seo Jin-hwan, who broke into her house in Seoul’s Gwangjin district in an attempt to rape her. It was only later found out by police that Seo had committed a similar crime just 13 days earlier and that he was wearing an electronic ankle monitor at the time.
The family then filed a compensation suit against the state, claiming Seo’s crime could have been prevented if police had properly managed DNA evidence found from the previous crime scene and if his ankle bracelet had been properly monitored.
Yonhap
You can read more at the link.