MARKESAN, Wis. — Authorities have identified the man killed in a house fire in east-central Wisconsin.

Green Lake County sheriff's officials say crews were called to the fire north of Markesan around 1:30 a.m. Sunday and found the house engulfed in flames. A search team found 29-year-old Justin Lewis in the home. He was later pronounced dead.

Authorities don't yet know what caused the fire.