UPDATED 06/15/11 9:48 a.m.

CHICAGO (CBS) — Authorities are investigating the death of a 25-year-old Lakeview neighborhood, who was apparently bitten by his dog after he collapsed and died.

Matthew Lebold, 25, of the 3400 block of North Janssen Avenue, was found in his home and pronounced dead on the scene at 1:13 p.m. Tuesday, according to the Cook County Medical Examiner’s office.

Sources said Lebold apparently overdosed on drugs and his pitbull bit a portion of his neck after he collapsed.

Police News Affairs Officer Veejay Zala said officers responded at 12:27 p.m. and found the man unresponsive.

A source said Lebold was a newly-minted lawyer.

An autopsy is scheduled for later Wednesday, the medical examiner’s office said.

The Sun-Times Media Wire contributed to this report.

Watch & Listen LIVE