CHICAGO (AP) — About half of the 22 fraternity members charged with hazing after a pledge died following a night of heavy drinking in Illinois had turned themselves in as of Tuesday night, police said.

Members of the Pi Kappa Alpha fraternity were charged after an investigation into the Nov. 2 death of NIU freshman David Bogenberger, 19. He was found unresponsive at the fraternity house in DeKalb, the community about 65 miles west of Chicago that’s home to Northern Illinois University. The DeKalb County Coroner’s Office said toxicology results found his blood alcohol content was about five times the legal limit for driving.