CHICAGO (CBS) — A 17-year-old boy who had been shot in the head before he was pulled from a house fire last week in north suburban Grayslake has died.

Firefighters responded at 12:34 a.m. Aug. 22 to the fire in the 300 block of Normandy Lane, according to Grayslake police.

Officers rescued a 17-year-old boy from the blaze, but discovered he had been shot in the head, police said.

Zackary Bollam was taken to Loyola University Medical Center in Maywood, where he died at 3:02 p.m. Saturday, according to police and the Cook County medical examiner’s office. An autopsy Sunday did not rule on cause and manner of death, with results pending further studies.

A .38-caliber pistol was recovered from the home, police said.

The boy’s grandmother, 64-year-old Deborah St. Antoine-Browne, was interviewed by detectives Thursday at Loyola, and her fingerprints and DNA were taken, police said.

About 4:50 p.m. that same day, St. Antoine-Browne jumped to her death from the hospital’s parking garage, according to police and the medical examiner’s office. Her death was ruled a suicide.

DCFS also notified police that prior to her death, St. Antoine-Browne gave her granddaughter a bottle of prescription medication and instructed her to take it all, police said. The granddaughter ingested some of the medicine before seeking medical attention.

St. Antoine-Browne was the legal guardian of her grandson and granddaughter, police said.

“With many interviews to be conducted and a large amount of evidence to process, this case remains open,” police said in a statement.

But they said “no additional suspects are being sought…”

(Source: Sun-Times Media Wire © Chicago Sun-Times 2016. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)