The Skagit Valley Herald reported police are treating the shooting as a homicide.
Police believe 25-year-old Trevor Braymiller is armed and dangerous. Braymiller is a convicted felon and is not allowed to have firearms.
Police first responded to calls of a child shot early Sunday.
Lt. Lin Tucker said Braymiller was a father figure to the child, although not his biological father.
The boy was taken to Skagit Valley Hospital but was pronounced dead there.
Tucker said the house where shooting occurred is well known to authorities. In 2011, police conducted a drug raid there. They have also seized firearms from Braymiller before.
Information from: Skagit Valley Herald, http://www.skagitvalleyherald.com
More Northwest Headlines
Everett man killed in car vs. bicycle collision near Mattawa Favorable weather conditions help Washington firefighters 4.3 earthquake recorded north of Coulee Dam NTSB releases factual report on Seattle news chopper crash Family, doctor say injured firefighter making slow progress Former hero pleads guilty to Oregon bank robbery Franchises want more time to pay Seattle $15 minimum wage 4 living units at Walla Walla Penitentiary on lockdown
Our new comment system is not supported in IE 7. Please upgrade your browser here.