Didn't a psychic contact police about a murder one of the Krays henchmen carried out.US Dept of Justice did a controlled test in the 70's
"THE RESEARCH DATA DO NOT SUPPORT THE CONTENTION THAT PSYCHICS CAN PROVIDE SIGNIFICANT ADDITIONAL INFORMATION LEADING TO THE SOLUTION OF MAJOR CRIMES."
In general psychics have the same success rate as educated guesswork.
I believe he described who did it and that the body was dumped at sea. Years later the henchman admitted it.
Then again, he may just have had information the police didn't.