Insane murders

The cops are about to go mad when a great judge goes missing without a trace.
After a lot of futile searching for months, the case is closed and left pending.
It's not until a year later after he goes missing when they find his body.
They don't actually find the body but it is the killer who informs them of where he hid the body.
Even after discovering the body it seems like the killer left no evidence behind.
They hunt for him day and night but the killer seems to know each and every single move they make.
He commits more murders but leaves behind only a single hint which is absolutely useless in finding him.
The most surprising fact is that his victims are not connected as he claims they are.
He offers to give them peace of mind if they can learn the connection and his identity.
Most of them back out but a young detective is set to find the connection and bring all the chaos to a halt
In the process he exposes himself to the killer.
The killer has a big dream that he has to fulfill no matter the cost; commiting crimes that can never be solved.
He wishes to be a role model to young aspiring criminals.
How will his schemes be uncovered if he has made sure to leave not even a single hint behind.
will all his cases remain pending?