Longtime police officer, wife die of carbon monoxide poisoning in Methuen

Following this story to see if more detail is released about the source of the CO and the alarm situation. Concerning that there might have been an issue with being able to hear the alarms.

https://www.wcvb.com/article/longtime-police-officer-wife-die-of-carbon-monoxide-poisoning-in-methuen-fellow-police-officer-says/35894787?fbclid=IwAR0YxLVISXQ9MVd59CyoXX0sgs8u8RqL4lqpDx4GW5dtW5jiBantF5ZdZOk#