( CNN ) -- The death of an 11-year-old boy at a Boone , North Carolina , hotel could have been prevented had police been told that the carbon monoxide that killed him was also to blame for two earlier deaths in the same room , the city 's police chief said . Chief Dana Crawford 's statement Monday came three days after Watauga County Medical Examiner Brent Hall resigned . It was n't clear if Hall 's resignation on Friday was related to the three deaths in Room 225 of the Best Western Plus Blue Ridge Plaza . Daryl Dean Jenkins and his wife , Shirley Mae Jenkins , died on April 16 ; 11-year-old Jeffrey Williams died on June 8 . Hall received an e-mailed copy of the toxicology report on Shirley Mae Jenkins ' death from the North Carolina Department of Health and Human Services on June 1 , a spokesman for the state agency said . 5 things to know about carbon monoxide . The report showed an often lethal concentration of carbon monoxide in her blood but did not provide a formal cause of death . The medical examiner did not share the results with police until June 8 -- the same day Williams died , Crawford told CNN in an e-mailed statement . Had police been told of the results sooner , Crawford said , `` I would like to think that we would have contacted our county health department , The Town of Boone Fire Department and the Town of Boone Planning and Inspections Department , at a minimum and tried to find the source of the carbon monoxide entering room 225 . '' Repeated telephone calls by CNN to Hall on Monday and Tuesday went unanswered . Police had requested the toxicology reports `` weeks before , '' CNN affiliate WSOC-TV reported Friday . According to the Charlotte station , fire investigators traced the carbon monoxide to a pool heater . Ventilation pipes for the pool heater were installed near the heating and air conditioning units for the room where the three people died , Boone police Capt . Andy Le Beau told CNN on Tuesday . Investigators also found holes in the ventilation pipes just below the room , he said . `` The heater itself runs off of natural gas . A byproduct of the pool heater is carbon monoxide . The ventilation system that ventilates the carbon monoxide goes to outside the building , in close proximity to the heating and air conditioning units of 225 , '' Le Beau added . `` In addition , there were deficiencies found in the ventilation pipes that were in the ceiling area just below room 225 . Carbon monoxide could also get into the room from that method as well . '' Search warrant documents show police removed two sections of exhaust pipe for the heater from below the room , WSOC said . CNN 's Joe Sutton and Melissa Gray contributed to this report .
NEW : Police found holes in ventilation pipes below room where three died , official says . Medical examiner resigns amid controversy over toxicology reports in hotel deaths . Comment: State says Hall got test results on June 1 ; police say he did n't tell them until June 8 .