New information on the murder of MSU student Dustyn Frolka.
A fourth suspect has pleaded guilty and will be sentenced at the end of the month.
Christopher Foley admitted helping plan the robbery in which Frolka was killed.
One of the other defendants told investigators that Foley showed them how to knock the victim unconscious without killing him.
He also helped burn evidence after the murder.
Foley pleaded guilty to conspiracy and will be sentenced as an adult on January 28th.