Centreville, IL  (KTRS)  Police are investigating after a fisherman made a grisly discovery at a metro-east lake.

Authorities say the 71-year-old man was fishing at Frank Holten State Park around 8 p.m. Tuesday when he hooked a body with his line in the lake. Police were then called to the scene.

Police say the victim is a male. His identity hasn’t been released or a possible cause of death.