The family of a Northern Illinois University freshman who died after a night of heavy drinking has filed a wrongful death lawsuit against the fraternity he was pledging.

Nineteen-year-old David Bogenberger was found dead at Pi Kappa Alpha fraternity on Nov. 2.

The night before, he and other pledges had attended an event there that the national fraternity organization says it did not sanction.

Toxicology results found Bogenberger's blood alcohol content was about five times the legal limit for driving.

The family's lawsuit says members of the fraternity failed to seek medical attention after the pledge had become unconscious.

Five fraternity members have been charged with felony hazing. Seventeen others face misdemeanor hazing charges.

The fraternity's national office in Memphis did not immediately return a call seeking comment Friday.