Police conducting a well-being check found the bodies of a 6-year-old boy and a 40-year-old man late Tuesday in the Logan Square neighborhood.

The bodies, found about 10:20 p.m. in a bedroom of the home in the 3500 block of West Lyndale Avenue, had been there for an unknown amount of time and were in an “advanced state of decomposition,” police said.

Area 5 detectives are conducting a death investigation.