Jason Davies' body was found in the Missouri River on Sept. 19 near Leavenworth, Kan.
Thursday, three people were charged in the 38-year-old's death.
Robert Jarrell, 39, and Martin Rilinger, 48, both face second degree murder charges in the case.
Dollie Williams, 39, is charged with tampering with evidence after authorities say she helped clean up blood and other evidence from the crime scene.
According to court documents, the charges stem from a struggle that ended with Jarrell and Williams beating the victim at an apartment at 802 N. 13th Street in St. Joseph.
A statement from Frank Till, with the St. Joseph Police Department, stated that the men struggled before hitting Davies multiple times with a bat and a frying pan.
Williams allegedly witnessed the crime. The probable cause statement alleges the men took Davies' body and dumped it in the Missouri River.
All three suspects have prior criminal charges. Rilinger is homeless and police say he was involved in a recent stabbing, but no charges were ever filed because the victims refused to testify.
They are being held at the Buchanan County jail.