EVERETT — A man who drowned his 6-year-old nephew in Lynnwood has been sentenced to more than 18 years in prison.

The Daily Herald reports Snohomish County Superior Court Judge Linda Krese said Wednesday that 21-year-old Andrew Henckel knew what he was doing when he killed Dayvid Pakko.

Henckel had been visiting from Kerrville, Texas, and was staying at his sister’s home in Lynnwood Oct. 16, 2017, when he was left alone with Pakko.

Court documents say Henckel drowned Pakko in a tub, wrapped his body in a blanket, placed him in a box and threw it into a dumpster. Hundreds of people participated in a search for the child before his body was found.

Defense attorney Michele Shaw argued that Henckel’s autism played a role in his decision-making.

Henckel pleaded guilty in December to second-degree murder as part of a plea deal.